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SERVICE MANUAL

1. lille 5 22 System Battery aaa seeded ad au pr gra dide dcs e ai a aatia d 5 23 vii Viii Chapter 6 Appendix A Index Figures Removing and Replacing Parts on the Mini Tower Chassis o 00 1 Recommended Tools 0c c cece eee eee eens 6 1 Precautionary Measures sccsexe ce kd wa eed oes EEG aa 6 2 Inside the Computer 3 252 ib Goud Gege ne eire aya hue She ta NG 6 3 Computer COVER 2 rta fie atn ausit UU TP GAN au tae E FS UR AN AWRA 6 4 Front Bezel isee oar Sura ata eee tees eed p tet A Ere e 6 5 Eject Power and Reset Buttons 0 00 ee eee 6 6 Front Panel Inserts a us shew sees ERR NAYUN SET eure see se 6 7 Control Panel i Ps saa ties graces Sans edes Guth aa ie cna hd dee aset tr anette 6 8 DIVES AANO AA Ms 6 9 Externally Accessible Drive Assemblies 0A aa 6 9 3 5 Inch Diskette Drive Assembly 00 00 eee eee ees 6 10 5 254nch Drive Assembly cece eee eee 6 11 Hard Disk Drive Bracket 0000 c cette 6 13 Hard Disk DING ue etate ct RE drca ru Pati a que 6 14 System Power Supply ma cle ANAL Ng edad pon haan eine a ie ha lau 6 15 Expansion Cards mae ea Sa eee RU S PER A Seaton AUR 6 16 Expansion Card Cage des pawan uERES E REEREeRSENCN aed 6 16 Expansi n GAO pana ma ANA NAP ANA halo a D k An Ka 6 17 Riser Boat sedersi ees eus PHL Sea hor ANNA GG TVed e DNA 6 18 System BOA ous oae qos HA baa de bre d doce pr mt 6 19 System Board Components 2 cce po
2. onto its corresponding tab Push evenly on both sides of the system board as you Slide it into position do not twist the system board System Board Components The subsections that follow Figure 6 19 contain procedures for removing replacing system board components parallel serial port 1 DIMM sockets 3 connectors stacked DIN ADM F 4 SEC cartridge connector SLOT1 PARALLEL SERIAL1 battery socket fA BATTERY keyboard mouse paaa stacked a chassis intrusion switch KYBD M OUSE ma WA connector INTRUSION main power input connector POWER_1 3 3 V power input USB connectors 2 USB serial port 2 connector POWER_2 connector SERIAL2 front of computer microprocessor fan E control panel connector PANEL connector FAN He diskette tape drive interface connector DSKT video connector MONITOR primary EIDE interface connector optional IDE1 integrated NIC secondary EIDE interface connector IDE2 system board jumpers connector ENET i E video memory upgrade socket ATI multimedia VIDEO UPGRADE connector AMC riser board connector RISER Figure 6 19 System Board Components Dell OptiPlex G1 Managed PC Systems Service Manual DIMMs To remove a DIMM from one of the two DIMM sockets follow these steps 1 Locate the two DIMM sockets see Figure 6 20 2 To remove a DIMM push outward on the DIMM socke
3. hard disk drive internal hard disk drive 3 5 inch diskette drive optional drive optional drive keyboard POWER2 P2 main memory P3 sockets DIMM_A b P4 DIMM B b MICROPROCESSOR 12 VDC fuses 2 5 VDC 5 VDC processor core regulator 13 3 VDC core VCC 42 1 to 3 5 VDC controller riser board management RTC J 3 3 VDC and NIC logic NVRAM 45 VDC PCI1 Pl POWER1 112 VDC through PWRGOOD PCI3 45 VFP P1 45 VDC 5 VDC ISA1 12 VDC through 12 VDC ISA3 PANEL USB KYBD MOUSE NOTE 5 VFP is routed to the optional integrated NIC logic on the system board and to P1 on the riser board Some computers have an additional connector P9 that may be used instead of P5 or P6 Figure 1 19 DC Power Distribution for the Midsize Computer Dell OptiPlex G1 Managed PC Systems Service M anual keyboard controller P1 management and NIC logic NVRAM POWER1 riser board 13 3 VDC PCI1 through PCI5 5 VDC 12 VDC 5 VFP P1 Syst
4. program loose diskette tape drive interface cable or loose power cable Diskette read failure Diskette sub System reset failed Failure occurred while system attempted to read diskette System could not suc cessfully issue reset command to diskette controller Faulty diskette faulty or improperly connected diskette tape drive inter face cable or loose power cable Faulty diskette tape drive controller defective sys tem board Diskette write protected Diskette write protect feature activated Diskette write protected Drive not ready Diskette missing from or improperly inserted in diskette drive Defective unformatted or improperly inserted diskette Gate A20 Gate A20 of the key Faulty keyboard controller failure board controller defective system board malfunctioned General failure Operating system can Operating system cor not execute command rupted or not installed properly Hard disk Hard disk drive failed to Incorrect configuration controller initialize settings in System Setup failure program improperly con Hard disk drive read failure Hard disk failure nected hard disk drive cable faulty hard disk drive controller sub system defective system board or loose power cable Dell OptiPlex G1 M anaged PC Systems Service M anual Table 3 2 System Error Messages continued Message Definition Probable Causes
5. 1 1 System Board Jumper Descriptions Jumper Description Settings RSVD1 Reserved J umper not installed default 450MHZ Micro Install jumper if the microprocessor s processor internal speed is 450 M Hz otherwise the speed jumper should not be installed 400M HZ Micro Install jumper if the microprocessor s processor internal speed is 400 MHz otherwise the speed jumper should not be installed 350MHZ Micro Install jumper if the microprocessor s processor internal speed is 350 M Hz otherwise the speed jumper should not be installed One set of speed jumpers must have a jumper plug installed otherwise the system defaults to an undetermined speed System Overview 1 17 Table 1 1 System Board Jumper Descriptions continued Jumper Description Settings 333M HZ Micro Install jumper if the microprocessor s processor intemal speed is 333 MHz otherwise the speed jumper should not be installed 300MHZ Micro Install jumper if the microprocessor s processor internal speed is 300 MHz otherwise the speed jumper should not be installed 266MHZ Micro Install jumper if the microprocessor s processor internal speed is 266 M Hz otherwise the speed jumper should not be installed BUS66M Extemalsystem Install jumper to set the external system clock clock speed at 66 M Hz otherwise the external system clock speed operates at 100 M Hz default BIOS Reserved J umper not installed default PSWD Passwo
6. 32 Dell OptiPlex G1 Managed PC Systems Service Manual Table 1 5 Technical Specifications continued Environmental continued Maximum shock Operating left side for low profile and midsize com puters operating in a vertical orientation and bottom half sine pulse with a change in velocity of 50 8 cm sec 20 inches sec Storage 27 G faired square wave with a velocity change of 508 cm sec 200 inches sec Altitude Operating 16 to 3048 m 50 to 10 000 ft Storage 16 to 10 600 m 50 to 35 000 ft The maximum operating temperature of 35 C 95 F is for altitudes below 914 6 m 3000 ft Above 914 6 m 3000 ft the maximum operating temperature is reduced System Overview 1 33 1 34 Dell OptiPlex G1 Managed PC Systems Service Manual CHAPTER 2 Basic Troubleshooting This chapter provides basic troubleshooting procedures applicable to all sys tems of the Dell OptiPlex G1 Managed PC family A brief explanation of how to load and start the system diagnostics is also provided at the end of the chap ter Dell recommends that you perform the following procedures in the order they are presented in this manual Chapter 3 Beep Codes and Error Mes sages also contains information to assist you in diagnosing computer failures that occur during the POST Initial User Contact When you first contact a user who has a problem ask the user to describe the probl
7. A 1 A 2 System Setup Screen configuration options title box system data Dell Computelr Corporation www dell com OptiPlexY G1 350L Pentium II Processor 350 MHz BIOS Version A01 Level 2 Cache 51 KB Integrated Service Tag A1234 System TIME naka ede alebat aie NBI ANA 10 11 12 System DanS anert e e n en a Nnna oes ua te eire et ee epe Thu May 28 1998 Diskette DETVE Ji AGENDA LARA Eee Soden 3 5 inch 1 44 MB Blaskette Drive Bt sore das Ee kk ve x v SRE Y wd KH Not Installed Primary DKITE 0 42 80 4 9 a ths AE DAGA oce TR e ETT n Hard Drive Pe Ci ULING do ie fn 4 x te doo Sa pos eee ep wales eS eT ay tudo Not Installed Secondary Dr4ve Ol ld siete Seek eee ace Bee ae es ATA CD ROM Reader Secondary Drgy 1 nuselwehdbex nd nsves e CR S e eoe ooo Erg Not Installed Hard Diek Drive Sequence ils int 4 JAD oot lt ENTER gt BOO SEQUENCE ue Re e SERE EI CEU LI ISIN 3 S ENTER System M moOZy ii AA ar eve er ante Pace She A bre ara ne on 32 MB SDRAM Video Memory 0 00 2 MB SGRAM Reserved MEMOry ahead Seba kA NAA SES None Reserved CPU SDS SC AA AA e eens tues ee 350 MHz Integrated Devices x94 eU Su Ves dee ns lt ENTER gt System SSCURTMEY Ka Dapa WG MANDA PA PALAPA NI eere teme ens sce eve e rage er quai ENTER Keyboard N mbhboCk 132 9 ho id a eS er ee PE ECT PE E On Report Keyboard EIrOrS yn DD AN Weg e i eR iue Report Ruto Ponet OU odd sexe c
8. Invalid config uration information please run SETUP program System Setup program contains incorrect system configuration settings Incorrect configuration settings in System Setup program or faulty battery Keyboard clock line failure Keyboard data line failure Keyboard E failure Keyboard stuck key failure System cannot commu nicate with keyboard Keyboard cable connec tor loose or improperly connected defective keyboard or defective keyboard mouse control ler defective system board Keyboard controller F failure Keyboard mouse con troller failed Defective keyboard mouse controller defec tive system board Memory address line failure at address read value expecting value Memory data line failure at address read value expecting value Memory double word logic fail ure at address read value expecting value Memory odd even logic failure at address read value expecting value Memory write read failure at address read value expecting value During memory test value read at address was incorrect Faulty or improperly seated DIM Ms or defec tive system board Beep Codes and Error Messages 35 36 Table 3 2 System Error Messages continued Message Definition Probable Causes Memory alloca tion error Software in use con flicts with operating system application or utili
9. Measures e a na arn fece tnt s e coe Eee aera wees 4 2 Inside the Computer s plaka WAG ani ented ESTO ERGO x 4 3 Using the Optional Stand for Vertical Orientation 4 4 Computer GOVE evo euh Re eR eR RR a RE re AG Fara pr dera 4 5 Eject Power and Reset Buttons 0 ccc eee ee eee 4 6 Front Panel Inserts sii aa GANA RAY oad ee RIA EE WA UE T 4 7 Canal P abel cus pisania raura a NG hata tele Rie Roe tr ss ar aie 4 8 DIVES Sio eue RR O rusa eut e du a BREE 4 9 Externally Accessible Drive Assemblies 4 10 3 5 Inch Diskette Drive Assembly 000 ees 4 10 Chapter 5 5 254nch Drive Assembly 2 aa a ma Re eroe pe huss 4 11 Hard Disk Drive Assembly 1 2 0 0 0000 cee ee eee 4 12 System Power Supply Ka seks wee wed Ges eRe Ee eee ees 4 13 EXPANSION GANGS rrr 4 14 ExpansioreCard Cage css uei o beeen tek Ved Gee ama RAE 4 14 Expansion p ro MP 4 15 Riser BOTA Ls atout edat ed ad DAANG NA NG Ser Na toad d ved dus 4 16 System Board a mna neusie uru nanan AS KAL RAN eee DEM S S 4 17 System Board Componerits vessel pelts eee aR ee Gets EY x edi 4 18 DIM MS npag Dad dp atten Ses hie URS Giao San adage meade d 4 18 Video Memory a usual ena oa nenian ede BERN AT AE M BA NG 4 19 MICFODIOCOSSOF S crue mar au reste oats uel e Leere t seta 4 21 SEC Cartridge Heat Sink Assembly aa 4 21 System Battery aus renee heeaviawadtieaweey te a e AU a 4 22 Removing a
10. and ISA PCI bus complies with PCI Specification 2 1 PCI 33 MHz ISA 8 33MHz two one PCI connector and one ISA con nector share an expansion card slot three one PCI connector and one ISA con nector share an expansion card slot or five two share expansion card slots five two PCI connectors share expansion card slots with ISA connectors 1 28 Dell OptiPlex G1 Managed PC Systems Service Manual Table 1 5 Technical Specifications continued Expansion Bus continued ISA expansion card connectors Low profile computers Midsize computers two one ISA connector and one PCI con nector share an expansion card slot three one ISA connector and one PCI con nector share an expansion card slot or two both share expansion card slots Mini tower computers four two ISA connectors share expansion card slots with PCI connectors NIC NGANGA teak oe optional integrated 3Com PCI 3C905B TX Wakeup On LAN Ethemet NIC operating at 10 or 100 Mbps Memory Architecture 64 bit nonparity noninterleaved DIMM sockets two gold contacts DIMM capacities 32 64 and 128 MB SDRAM Minimum RAM 32 MB Maximum RAM 256 MB L2 cache memory 512 KB pipeline burst fourway set associative write back SRAM BIOS address FOOOOh NIC ROM address C8000h Drives Externally accessib
11. at the bottom and the drives are at the top To remove the stand tum the computer over so the stand is at the top loosen the screw and lift the stand away and then place the computer in a horizontal position 44 Dell OptiPlex G1 M anaged PC Systems Service M anual Computer Cover securing buttons 2 front of computer Figure 4 3 Computer Cover Removal To remove the computer cover follow these steps 1 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 2 Remove the padlock if one is installed 3 Press in on the two securing buttons until the cover is free to swing up 4 Raise the back of the cover and pivot it toward the front of the computer 5 Lift the cover off of the hooks at the front of the chassis Three plastic hooks on the inside front part of the cover secure it to the chassis Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with proper airflow inside the computer NOTE After removing and replacing the chassis the chassis intrusion detector alerts you that the cover has been removed Refer to Chassis Intrusion Detec tion in Chapter 1 for instructions on resetting the chassis intrusion detector Removing and Replacing Parts on the Low Profile Chassis 4 5 Eject Power and Reset Buttons eject button computer cover upside down reset button LY F5 SI 9g power button Fig
12. cartridge release latches out ward to lock the assembly onto the metal standoffs System Battery lt a BATTERY socket Figure 4 21 System Battery Installation To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details 2 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 3 Remove the computer cover 4 Remove the expansion card cage and locate the battery in the front right corner of the system board adjacent to the DIMM con nectors see Figure 4 16 CAUTION If you pry out the battery with a blunt object be careful 1 not to touch the system board with the object Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery Otherwise you may damage 4 22 Dell OptiPlex G1 Managed PC Systems Service M anual the system board by prying off the socket or by breaking traces on the system board 5 Remove the battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plas tic screwdriver AN WARNING There is a danger of the new battery exploding if it is incorrectly installed When you replace the system battery orient the new battery with the facing up see Figure 4 20 Replace t
13. connectors on the system board or drives 120 Dell OptiPlex G1 Managed PC Systems Service Manual Table 1 4 OptiPlex G1 DC Voltage Ranges Voltage Range Maximum Output Current 3 3 VDC 5 VDC 12 VDC 12 VDC 5 VDC 5 VFP3 3 15 to 3 45 VDC 4 75 to 5 25 VDC 1140 to 12 60 VDC 10 80 to 13 20 VDC 4 50 to 5 50 VDC 4 75 to 5 25 VDC 12 0 A low profile computers 14 0 A midsize and mini tower computers 18 0 A low profile computers 22 0 A midsize and mini tower computers 3 0 A low profile computers 6 0 A midsize and mini tower computers 0 3 A low profile computers 0 3 A midsize and mini tower computers 0 3 A low profile computers 0 3 A midsize and mini tower computers 10 mA 1 The combined load on the 5 VDC and 3 3 VDC outputs should not exceed 105 W on the low profile computers or 140 W on the midsize mini tower computers Withstands surges of up to 110 A to support disk start up operations VFP volts flea power sometimes called standby power System Overview 1 21 1 22 Pin Assignments for the DC Power Connectors The powersupply output voltages can be measured at the back wire side of the connectors without disconnecting them Figures 1 15 through 1 17 show the wire side of the connectors 5 VDC white 5 VDC red common black 5 VDC red common black 5 VDC red common black TESC brown PSO
14. down into position 5 12 Dell OptiPlex G1 Managed PC Systems Service Manual Hard Disk Drive drive mounting screws for drive mounting screws bottom mounted drive 4 for side mounted drive 4 R AS ee hard disk Q O g drive bracket Sa hard disk drive Figure 5 12 Hard Disk Drive Removal To remove the hard disk drive follow these steps 1 Remove the hard disk drive bracket 2 Remove the four screws that attach the hard disk drive to the hard disk drive bracket One hard disk drive attaches to the hard disk drive bracket at the sides of the drive The other hard disk drive attaches to the hard disk drive bracket at the bottom of the hard disk drive 3 Slide the drive out of the hard disk drive bracket Removing and Replacing Parts on the Midsize Chassis 5 13 System Power Supply power supply DC power cables securing tab slot Figure 5 13 System Power Supply Removal To remove the system power supply follow these steps 1 Disconnect the AC power cable from the back of the power supply 2 Free the system power supply from the securing tab labeled RELEASE gt and rotate it to the right until it stops Press the securing tab to the left to release the power supply 3 Disconnect the DC power cables from the system board and the drives 4 Lift the front end of the system power supply up and move it to the right to disengage the power supply from the slot in the chassi
15. ees 6 14 System Power Supply Removal 2 0005 6 15 Expansion Card Cage Removal 6 16 Expansion Card Removal a 6 17 Riser Board Removal 0 0000 e cece eee eae 6 18 System Board Removal 00000 cee ence eer 6 19 System Board Components 000 eee e eens 6 20 DIMM Removal 6 21 DIMM Installation re bt C rs 6 21 Tables Figure 6 22 Figure 6 23 Figure 6 24 Figure A 1 Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 3 1 Table 3 2 Table A 1 Installing a Video M emory Upgrade Module 6 22 SEC Cartridge Heat Sink Removal 6 23 System Battery Installation a 6 24 System Setup Screen 3s kwan edant ede ea e s A 2 System Board J umper Descriptions 1 17 Interrupt AssIgDrmients os Us esed ae tree perve ge 1 18 DREQ Line Assignments 000000 c cece eee 1 19 OptiPlex G1 DC Voltage Ranges 1 21 Technical Specifications 0A 1 28 POST Beep Codes cc cece eens 3 1 System Error M essages cc eee ee ees 3 3 System Setup OptiONS 1s aa uem I3 e EY ers A 3 Xi Xii Read This First A prerequisite for using this manual to service Dell computer systems is a basic knowledge of IBM compatible PCs and prior training in IBM compatible PC troubleshooting techniques In addition to information provided in this manual and the User s Guid
16. firmly into the socket and pivot the module downward until it clicks into place If you do not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 4 Replace the expansion card cage 5 Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power button on the computer to reboot the system As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program 6 22 Dell OptiPlex G1 Managed PC Systems Service M anual 6 Enter the System Setup program and confirm that 4 MB is the value for the Video Memory option If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and verify that the computer acknowl edges the module 7 Run the Video Test Group in the system diagnostics to test the new video memory upgrade module Microprocessor To take advantage of future options in processor speed and functionality you can replace the microprocessor on your system board with any Dell supported microprocessor upgrade The microprocessor upgrade kit is shipped with an SEC cartridge heat sink assembly which includes the microprocessor micro processor heat sink and L2 cache memory module You may also have to reseat or replace an SEC cartridge heat sink assembly during no
17. from the release handle until it stops then lift the riser board away from the expansion card cage 6 18 Dell OptiPlex G1 Managed PC Systems Service Manual System Board slots 5 tabs 5 Figure 6 18 System Board Removal To remove the system board follow these steps 1 Disconnect all cables from their connectors at the back of the computer Remove the expansion card cage Disconnect all cables from the system board Remove the screw that secures the system board to the bottom of the chassis Slide the system board toward the front of the chassis until it stops Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTES If you are replacing the system board remove all DIMMs the video memory upgrade module if present the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install them on the replacement board Also set the jumpers on the new system board so that they are identical to those on the old board unless a microprocessor upgrade is being installed If the original system board has a NIC connector ensure that the replacement board has a NIC connector When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to engage the grounding clip Removing and Replacing Parts on the M ini Tower Chassis 6 19 6 20
18. manufacturer s instructions 6 Insert the battery into the socket with the positive side labeled 4 facing upwards into its socket and snap it into place 7 Replace the expansion card cage reconnect all cabling replace the computer cover and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer wait 10 or more minutes and reenter the System Setup program to ensure that the date and time are still correct indicating that the system battery is functioning correctly Removing and Replacing Parts on the Mini Tower Chassis 6 25 6 26 Dell OptiPlex G1 Managed PC Systems Service Manual APPENDIX A System Setup Program This appendix which applies to all Dell OptiPlex G1 Managed PC computer families describes the System Setup program which is used to change the system configuration information stored in NVRAM on the system board To enter the System Setup program follow these steps 1 Turn on or reboot the system 2 Press lt F2 gt when the prompt appears in the upper right corner of the Dell logo screen If you wait too long and the operating system begins to load into memory et the system complete the load operation then shut down the system and try again NOTE To ensure an orderly system shutdown consult the documentation that accompanied the operating system System Setup Program
19. operate from standard AC power outlets in the U S and all international countries The power supply used in the midsize and mini tower chassis configurations is a higher capacity model than that used in the low profile chassis configuration Dell OptiPlex G1 systems have a special power supply that provides trickle flea power to support the Wakeup On LAN feature when computer power is off Dell OptiPlex G1 M anaged PC Systems Service M anual Location of Major Components Figure 1 2 shows the front panel features for the three chassis types Figures 1 3 through 1 5 show intemal features of the three chassis types mm diskette drive TN removable HAH OX media device ower button indicat diskette drive pres d bii hard disk drive access indicator reset button access indicator Low Profile Chassis It diskette drive aa aj van o removable S diskette drive access indicator power button hard disk drive power indicator access indicator reset button Midsize Chassis NM diskette drive BW I removable media device diskette drive access indicator power indicator power button hard disk drive reset button access indicator Mini Tower Chassis Figure 1 2 Front Panel Features System Overview 1 7 1 8 3 5 inch diskette drive diskette tape drive interface cable power supply hard disk drive padlock ring interface cable hard disk drive voltage selection ZZ de
20. or the reset button use a small screwdriver and push in on the two or three plastic clips that hold the button to the bezel When these clips are released the button comes free from the bezel 6 6 Dell OptiPlex G1 Managed PC Systems Service Manual Front Panel Inserts front bezel id NG ID 5 25 inch front panel insert ring tabs 2 Figure 6 5 5 25 Inch Front Panel Insert Removal To remove a 5 25 inch front panel insert follow these steps 1 Hold the bezel with the front facing you 2 From the front of the bezel use your thumbs to press inward on the insert until it slides off the two posts To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening and then press the ring tabs over the posts Removing and Replacing Parts on the Mini Tower Chassis 6 7 Control Panel chassis hooks 2 control panel Figure 6 6 Control Panel Removal To remove the control panel follow these steps 1 2 Remove the hard disk drive bracket Disconnect the control panel cable from the PANEL connector on the system board see Figure 6 20 Remove the mounting screw holding the control panel to the chassis Slide the control panel out of the hooks holding it to the chassis Note the routing of the control panel cable as you remove it from the chassis 6 8 Dell OptiPlex G1 Managed PC Systems Service Manual Drives Figure 6 8 shows an ex
21. powersupply detent link securing tab Figure 6 14 System Power Supply Removal To remove the system power supply follow these steps 1 5 Disconnect the AC power cable from the back of the system power supply Free the system power supply from the securing tab labeled RELEASE gt and rotate it upward until it locks Press the securing tab to release the power supply Disconnect the DC power cables from the system board and the drives Facing the left side of the computer move the front end of the sys tem power supply toward you and lift it up to disengage the power supply from the slot in the chassis Lift the system power supply from the computer When you reinstall the system power supply place the power supply detent link over the pin on the power supply as you position the power supply in the chassis opening Removing and Replacing Parts on the Mini Tower Chassis 6 15 Expansion Cards The computer has a removable expansion card cage The expansion card cage contains the riser board and any installed expansion cards Dell recommends that you remove the expansion card cage first before removing or installing expansion cards If you are not removing any expansion cards leave the external cables attached to them Expansion Card Cage bottom slot 2b VA o 7 chassis expansion card cage Figure 6 15 Expansion Card Cage Removal To remove the expansion card cage follow th
22. procedures in this chapter diskette drive removable media device in external bay drive cage for external drive internal hard disk drive o chassis intrusion CM switch expansion card cage Figure 4 1 Internal View of the Low Profile Compute r Removing and Replacing Parts on the Low Profile Chassis 43 Using the Optional Stand for Vertical Orientation Dell offers an optional stand that you can attach to the computer for a mini tower vertical orientation Although you can attach and remove the stand at any time with a minimum of system disruption it is easiest to attach before you set up your computer and connect the back panel cables To attach the stand follow these steps 1 Turn the computer onto its right side so that the drive bays are at the bottom 2 Fit the stand onto what was the left side of the computer Position the stand as shown in Figure 4 2 Align the large round hole in the stand with the securing button on the side of the cover and align the cap tive thumbscrew in the stand with the screw hole in the cover captive screw locator pin on underside of floor stand Figure 4 2 Attaching the Optional Stand for Vertical Orientation As you lower the stand into place make sure that the locator pin see Figure 4 2 fits into the comer hole of the hole pattem as shown When the stand is in place tighten the thumbscrew 3 Rotate the computer so that the stand is
23. remove the 3 5 inch diskette drive assembly follow these steps 1 Disconnect the DC power cable and the interface cable from the back of the diskette drive 2 Press the two 3 5 inch diskette drive assembly latches to the left to release the assembly Rotate the left side of the assembly up and lift the assembly out of the chassis 3 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure that the mounting holes on the right side of the drive engage the two hooks on the bracket 4 10 Dell OptiPlex G1 Managed PC Systems Service Manual 5 25 Inch Drive Assembly front of computer drive mounting screws 4 Sse amp Figure 4 9 5 25 Inch Drive Assembly Removal To remove a 5 25 inch drive assembly follow these steps 1 2 Remove the 3 5 inch diskette drive assembly Disconnect the DC power cable and the interface cable from the back of the 5 25 inch drive Lift the 5 25 inch drive assembly straight up and out of the chassis Lay the 5 25 inch drive assembly upside down then remove the four screws attaching the drive to the bracket When you replace the 5 25 inch drive place the front of the drive toward the front of the bracket then install the four screws but do not tighten them Align the screws with the score marks on the bracket and tighten the screws in the order stamped on the botto
24. switch assis Ca intrusion 5 switch AC power f NN t receptacle JAN m parallel port connector expansion card serial port cage connector mouse xpansion card si connector expansion card slots 3 keyboard connector USB connectors 2 NIC connector optional serial port 2 connector video connector security cable slot Figure 1 3 Internal View of the Low Profile Chassis Dell OptiPlex G1 Managed PC Systems Service Manual 3 5 inch diskette drive diskette tape drive interface cable drive cage hard disk drive power supply bracket AC power receptacle voltage i selection gee switch SSS Fi switch n PS 4 Te dlock ri A T d B hard disk drive padlock ring f interface cable parallel port connector So NN NAS 3 expansion card cage serial port 1 connector mouse connector expansion card slots 5 keyboard connector USB connectors 2 NIC connector optional serial port 2 connector video connector security cable slot Figure 1 4 Internal View of the Midsize Chassis System Overview 1 9 1 10 voltage AC power selection receptacle power switch security cable slot external drive bays parallel port connector serial port 1 connector keyboard connector mouse connector J bracket USB connectors 2 _I5 tx IC pe interface cable serial port 2 AW S NA connector L lis switch video connector ee 5 AS
25. the battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plas tic screwdriver WARNING There is a danger of the new battery exploding if it is incorrectly installed When you replace the system battery orient the new battery with the facing up see Figure 5 23 Replace the battery only with the same or equivalent type recommended by the manufacturer Dis card used batteries according to the manufacturer s instructions 6 Insert the battery into the socket with the positive side labeled facing upwards and snap it into place 7 Replace the expansion card cage reconnect all cabling replace the computer cover and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer wait 10 or more minutes and then reenter the System Setup program to ensure that the date and time are still correct indicating that the system battery is functioning correctly 5 24 Dell OptiPlex G1 Managed PC Systems Service Manual CHAPTER 6 Removing and Replacing Parts on the Mini Tower Chassis This chapter provides procedures for removing the components assemblies and subassemblies in the Dell OptiPlex G1 mini tower computer If you are ser vicing a low profile or midsize chassis use Chapter 4 or 5 as appropriate for your system Unless otherwise note
26. the computer or removing a component from the computer s system board to avoid possible damage to the system board Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available periodically touch an unpainted metal surface on the back of the computer to discharge any static charge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex G1 M anaged PC Systems Service M anual Inside the Computer Figure 6 1 shows an intemal view of the interior of the mini tower computer and identifies major components for orientation Refer to this illustration as needed when performing the component removal replacement procedures in this chapter power supply hard disk drive bracket o expansion card 1 cage riser board Figure 6 1 Internal View of the Mini Tower Computer Removing and Replacing Parts on the Mini Tower Chassis 6 3 Computer Cover release button Figure 6 2 Computer Cover Removal To remove the computer cover follow these steps 1 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 2 Remove the padlock if one is installed 3 Facing the left side of the computer press the release button at the bottom left corner of the front bezel 4 Lift the bott
27. yellow activity indicatorflashes when the system is transmitting or receiving network data A high volume of network traffic may make this indicator appear to be in a steady on state Agreen ink integrity indicator lights up when there is a good connection between the network and the NIC When the green indicator is off the sys tem is not detecting a physical connection to the network Network Cable Requirements The computer s NIC connector RJ 45 is designed for attaching to a UTP Ether net cable The other end of the cable connects to an RJ 45 jack wall plate or to an RJ 45 port on a UTP concentrator or hub depending on the network configuration System Overview 1 5 1 6 Chapter 4 Using Integrated Devices in the Reference and Installation Guide provides instructions for connecting the computer to and configuring it for use on an Ethemet network Full Set of I O Ports For desktop connectivity the OptiPlex G1 systems include the following ports e 25 hole bidirectional parallel port with EPP ECP and demand mode DMA support Two Universal Serial Bus USB ports Two 9 pin serial ports Two PS 2 ports mouse and keyboard One 15 hole video connector e OneRJ45 Ethernet NIC connector optional See Figures 1 3 through 1 5 for I O port identifiers for the various chassis configurations Power Supply The OptiPlex G1 systems are equipped with a switch selectable 115 230 VAC power supply that can
28. 2 MB synchronous graphics random access memory SGRAM video memory expandable to 4 M B using a video memory upgrade kit e 5 hole monitor port ATI Multimedia Channel The ATI multimedia channel AM C implements a local graphics bus that allows external devices to attach directly to the graphics controller The AMC allows devices to transfer video stream data to the graphics controller for example MPEG 2 decoding for digital video disk DVD applications receive video stream data from the graphics controller for example TV Out circuitry or do both simultaneously M ost of the video stream data transfers occur on the AMC without congesting the PCI bus bandwidth The 40 pin AMC connector shown in Figure 1 11 consists of three ports into the graphics controller a digital video stream DVS port for video input into the graphics controller a multimedia peripheral port M PP for video input and out put from the graphic controller and an interintegrated circuit I2C compatible serial control port for controlling the attached devices A fourth port audio mix ing bus AMB is not supported by the system To route mixed audio from an AM C compliant adapter card to the system board CD ROM audio cables must 14 Dell OptiPlex G1 M anaged PC Systems Service M anual be attached from the adapter card s CD ROM audio input and CD ROM audio output connections to the AMC connector See the AMC compliant adapter card s documentation for mo
29. 27 power supply 115 230 VAC 1 6 about 1 6 1 20 cables low profile computer 1 23 cables midsize and mini tower computers 1 25 flea power 1 6 power distribution low profile computer 1 24 power distribution midsize computer 1 26 power distribution mini tower computer 1 27 removal low profile computer 4 13 removal midsize computer 5 14 removal mini tower computer 6 15 service data 1 20 precautionary measures low profile computer 4 2 midsize computer 5 2 mini tower computer 6 2 R remote management features 1 15 reset button removal low profile computer 4 6 midsize computer 5 6 mini tower computer 6 6 resource conflicts eliminating 2 5 riser board removal low profile computer 4 16 midsize computer 5 17 mini tower computer 6 18 S SEC cartridge heat sink assembly about 1 14 removal low profile computer 4 21 removal midsize computer 5 22 removal mini tower computer 6 23 secondary cache memory 1 3 service related information 1 15 1 20 1221 SMART technology 1 3 specifications technical 1 28 subsystems expansion 1 12 memory 1 14 NIC 1 5 SVGA subsystem 1 4 Switch AC voltage selection about 1 6 low profile computer 1 8 midsize computer 1 9 mini tower computer 1 10 system battery removal low profile computer 4 22 midsize computer 5 23 mini tower computer 6 24 system board component locations 1 16 features 1 16 jumper locatio
30. 4 Lift the riser board away from the expansion card cage When you replace the riser board be sure that the alignment feature on the expansion card cage engages with the alignment slot 4 16 Dell OptiPlex G1 Managed PC Systems Service Manual System Board Screw Slots 5 tabs 5 Figure 4 15 System Board Removal To remove the system board follow these steps 1 Disconnect all cables from their connectors at the back of the computer Remove the expansion card cage Disconnect all cables from the system board Remove the screw that secures the system board to the bottom of the chassis Slide the system board toward the front of the chassis until it stops Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTES If you are replacing the system board remove all DIMMs the video memory upgrade module if present the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install them on the replacement board Also set the jumpers on the new system board so that they are identical to those on the old board unless a microprocessor upgrade is being installed If the original system board has a NIC connector ensure that the replacement board has a NIC connector When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to
31. Dell OptiPlex G1 Managed PC Systems Information in this document is subject to change without notice 1994 1998 Dell Computer Corporation All rights reserved Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden Trademarks used in this text Dell the DELL logo and OptiPlex are registered trademarks of Dell Computer Corporation MS DOS Microsoft and Windows are registered trademarks of Microsoft Corporation Intel and Pentium are registered trademarks and MM X is atrademark of Intel Corporation BM is a registered trademark of International Business M achines Corporation 3Comis a registered trademark of 3Com Corporation Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own May 1998 P N 6562C Contents Chapter 1 System Overview o coo oo 0o l Chassis BIIK AA 1 2 Chassis Similarities 0 0 0 0 ccc ee Im II 1 2 Standard Features 24 coss EDAD xke AIRE Yu xq Y Ev REI 1 2 Pentium II Microprocessor 00 e eee eee 1 2 Secondary L2 Caches s 5er Arar s REOR PER Ian vere 1 3 Main Memory 4er ree BA oe Said NEA Rate ee 1 3 Upgradable BIOS in Flash Memory 0 eee eee 1 3 EIDE Subsystem co s ebbe eet AA A BAI E E este Sh a
32. I multimedia two 9 pin connectors 16550 compatible one 25 hole connector bidirectional one 15 hole connector 6 pin mini DIN 6 pin mini DIN RJ 45 connector two USB compliant connectors two 40 pin connectors on PCI local bus 34 pin connector 40 pin connector 1 30 Dell OptiPlex G1 Managed PC Systems Service Manual Table 1 5 Technical Specifications continued Key Combinations lt CiN gt lt Alt gt lt Del gt restarts reboots the system po EET starts System Setup program during the POST only lt Ctrnl gt lt Alt gt lt gt toggles microprocessor speeds on 101 key keyboard in MS DOS real mode only lt Ctrl gt lt Alt gt lt gt toggles microprocessor speeds on 102 key keyboard in MS DOS real mode only Controls and Indicators Reset control push button Power control push button Power indicator green LED in normal operation flashing green LED in sleep state green LED on riser board Diskette drive access indicator a a aunan uns green LED Hard disk drive access indicator ee eae tee ee green LED Link integrity indicator on systems with NIC connector green LED Activity indicator on systems with NIC connector yellow LED Power Power supply wattage Low profile computers 145 W Midsize computers 200W Mini tower computers 200 W P
33. ING The single edge contact SEC cartridge heat sink assembly can get extremely hot Be sure that the assembly has had sufficient time to cool before you touch it While reseating the SEC cartridge heat sink assembly use a wrist grounding strap or maintain contact with a metal surface on the chassis The microprocessor is physically located in a SEC cartridge heat sink assembly on the system board To reseat the microprocessor remove the SEC cartridge heat sink assembly and reinstall it as described in SEC Cartridge Heat Sink Assembly in Chapter 4 5 or 6 as appropriate for your system To reseat a DIMM remove it from its socket and reinstall it as described in DIMMs in Chapter 4 5 or 6 as appropriate for your system If you need to reseat an expansion card remove it from its connector and reinstall it as described in Expansion Cards in Chapter 4 5 or 6 as appropriate for your system 4 Verify that all jumpers are set correctly For infomation about these jumpers see System Board J umpers in Chapter 1 5 Check all cable connectors inside the computer to verify that they are firmly attached to their appropriate connectors 6 Reinstall the computer cover 7 Reconnect the computer and any attached peripherals to their power sources and turn them on Does the problem appear to be resolved Yes No further steps are necessary Terminate the procedure No Proceed to the next sections Eli
34. N gray 5 VDC red 11 12 13 14 15 16 17 18 19 20 mnomngmmgumnmmmnssmurtc 0000000000 1 2 3 4 5 6 7 8 9 10 5 VDC red common black common black common black 5 VDC red 12 VDC blue common black 12 VDC yellow PWRGOOD orange 45 VFP purple 1 pin11 PSON should measure between 4 and 5 VDC except when the power button on the front panel is pressed taking PSON to its active low state Pin 19 Thermal fan speed control TFSC is a powersupply input signal used to control the powersupply fan speed 3 Pin 5 PWRGOOD should measure between 44 and 5 VDC when the power supply is on and operating to indicate that all powersupply output voltages are within ranges specified in Table 1 4 Figure 1 13 DC Power Connector P1 N SST ne u BERE A A Ko plum cd TI a vpct llow 45 VDC red asus Br commoni black common black common black common back 12 VDC yellow de VDE fea Figure 1 14 DC Power Connectors P2 Midsize and Mini Tower Chassis P3 P4 P5 P6 and P9 All OptiPlex G1 Chassis Dell OptiPlex G1 Managed PC Systems Service Manual pooo nn Peor 1 2 3 4 5 6 Ll 43 3 VDC blue white 43 3 VDC blue white 43 3 VDC blue white common black common black common black Figure 1 15 DC Power Connectors P2 Low Profile Chassis and P7 All OptiPlex G1 Chassis DC Power Distribution Figures 1 18 thr
35. N To avoid possible damage to the video memory upgrade socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the video memory upgrade module as shown in Figure 5 21 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mates with the socket key 3 Press the video memory upgrade module firmly into the socket and pivot the module downward until it clicks into place If you do not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 4 Replace the expansion card cage 5 Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power button on the computer to reboot the system As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program Removing and Replacing Parts on the Midsize Chassis 5 21 6 Enter the System Setup program and confirm that 4 MB is shown in the Video Memory category If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and verify that the computer acknowl edges the module 7 Run the Video Test Group in the system diagnostics to test the new video memory upgrade module Microprocessor To ta
36. OST Beep Codes Beep Code Error Probable Causes 1 1 3 NVRAM write read failure Defective system board 1 1 4 BIOS checksum failure Faulty BIOS or defective sys tem board 1 2 1 Programmable interval timer Defective system board failure 1 2 2 DMA initialization failure 1 2 3 DMA page register write read failure Beep Codes and Error Messages 31 3 2 Table 3 1 POST Beep Codes continued Beep Code Error Probable Causes 13 1 M ain memory refresh verifi cation failure Faulty or improperly seated DIMM or defective system board 1 3 2 No memory installed No memory installed or faulty or improperly seated DIMM 1 3 3 13 4 14 1 14 2 2 1 1 through 2 4 4 Chip or data line failure in the first 64 KB of main memory Odd even logic failure in the first 64 KB of main memory Address line failure in the first 64 KB of main memory Parity failure in the first 64 KB of main memory Bit failure in the first 64 KB of main memory Faulty or improperly seated DIMM 3 11 3 12 3 13 3 14 Slave DM A register failure Master DM A register failure Master interrupt mask regis ter failure Slave interrupt mask register failure Defective system board 324 Keyboard controller test failure Faulty keyboard controller defective system board 3 3 4 3 4 1 3 4 2 Screen initialization failure Screen retrace test failure Search for video ROM fa
37. a and instruction caches internal math coprocessor and the MM X instruc tion set for high performance in complex multimedia and communications environments The Pentium Il microprocessor also uses a technique called single instruction multiple data SIM D which permits processing data ele ments in parallel for additional system performance enhancement The microprocessor is physically located in a single edge contact SEC cartridge heat sink assembly on the system board for ease of upgrading when faster processors become available Contact Dell Computer Corporation for information about Dell supported microprocessor upgrades 12 Dell OptiPlex G1 M anaged PC Systems Service M anual Secondary L2 Cache For additional performance the OptiPlex G1 systems employ a secondary cache memory subsystem with a cache memory controller and 512 KB of pipeline burst SRAM cache memory The L2 cache SRAM is located in the SEC cartridge heat sink assembly on the system board Main Memory Main memory for the OptiPlex G1 systems ranges from a minimum of 32 MB to amaximum of 256 MB All main memory is implemented using high speed non ECC DIM Ms One or two DIMMs ranging in memory capacity sizes from 32 to 128 MB may be used to provide a maximum memory capacity of 256 MB Upgradable BIOS in Flash Memory The system BIOS is implemented in flash ROM which allows for easy BIOS upgrades using diskette files or files downloaded from Dell s home page
38. a program tests the portion of main memory RAM required for loading the diagnostics If a main memory error is detected a message indicates which DIMM has failed If no errors are found in main memory the diagnostics loads and the Diagnostics M enu appears 2 Observe the monitor screen for the Diagnostics Menu This menu lets you choose the following options or exit to the MS DOS prompt e Run Quick Tests Runs selected tests from all test groups to quickly locate a failure or to indicate where further testing is needed to isolate a failure e Run All Tests Runs all tests for a thorough test of the system e Run Specific Tests Tests a particular area or subsystem If the Diagnostics M enu does not appear check the diskette drive connec tions insert a copy of the diagnostics diskette into the diskette drive and reboot the system If the Diagnostics M enu still does not appear proceed to the next section Getting Help For a complete description of the diskette based diagnostics see Diskette Based Diagnostics in the online Network Administrator s Guide Getting Help If none of the troubleshooting procedures in this chapter or the tests in the server based hard disk based or diskette based diagnostics reveals the source of the problem or leads to the proper troubleshooting steps for deter mining the source of the problem call Dell for technical assistance For instructions see Contacting Dell in the onlin
39. acle 1 8 AC voltage selection switch low profile computer 1 8 midsize computer 1 9 mini tower computer 1 10 universal power supply 1 6 advanced expansion features 1 12 AGP subsystem 1 4 ATI multimedia channel 1 4 battery removal low profile computer 4 22 midsize computer 5 23 mini tower computer 6 24 beep codes 3 1 BIOS flash ROM 1 3 boot routine observing while troubleshooting 2 3 bracket hard disk drive removal midsize computer 5 12 mini tower computer 6 13 C cabling network requirements 1 5 verification 2 2 CD ROM drives removal low profile computer 4 11 removal midsize computer 5 11 removal mini tower computer 6 11 chassis configurations 1 1 differences 1 2 intrusion detection 1 5 similarities 1 2 chassis intrusion detection 1 5 computer components illustrated low profile computer 1 8 components illustrated midsize computer 1 9 components illustrated mini tower computer 1 10 controls and indicators 1 7 cover removal low profile computer 4 5 cover removal midsize computer 5 5 Index 1 computer continued cover removal mini tower computer 6 4 diagnostics See diagnostics DMA channel assignments 1 19 expansion features 1 12 features 1 1 1 2 front panel views 1 7 internal views 1 8 1 9 1 10 interrupt assignments 1 18 jumper information 1 17 orientation information 1 11 power distribution diagram low profile c
40. ample of drive hardware that can be installed in the computer Refer to this figure when you perform any of the procedures in the following subsections diskette tape drive 3 5 inch diskette interface cable drive Ng Q hard disk drive bracket DC power cable DSKT connector secondary EIDE interface E connector IDEZ primary EIDE EIDE cable interface connector IDE 1 Figure 6 7 Drive Hardware Externally Accessible Drive Assemblies The following subsections contain removal replacement procedures for drives installed in the externally accessible drive bays Removing and Replacing Parts on the Mini Tower Chassis 6 9 3 5 Inch Diskette Drive Assembly Oy retaining tab release button Figure 6 8 3 5 Inch Diskette Drive Assembly Removal To remove a 3 5 inch diskette drive assembly follow these steps 1 Disconnect the DC power cable and the interface cable from the back of the 3 5 inch diskette drive 2 Press the retaining tab release button and pull the drive assem bly forward to remove it 3 Remove the drive mounting screw from the left side of the drive and remove the drive from the bracket see Figure 6 9 6 10 Dell OptiPlex G1 Managed PC Systems Service Manual drive mounting screw hooks 2 amp 2 er Figure 6 9 3 5 Inch Diskette Drive Bracket When you replace the 3 5 inch diskette drive be sure that the two hooks on the right side of the bracket engage the mo
41. ation is provided Recommended Tools Most of the procedures in this chapter require the use of one or more of the following tools Small flat blade screwdriver Wide flat blade screwdriver 1 and 2 Phillips screwdrivers 1 4 inch nutdriver Tweezers or long nose pliers Also use a wrist grounding strap as explained in the next section Precaution ary Measures Removing and Replacing Parts on the Midsize Chassis 5 1 5 2 Precautionary Measures Before you perform any of the procedures in this chapter take a few moments to read the following waming for your personal safety and to prevent damage to the system from ESD WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system perform the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also disconnect any telephone or telecommunication lines from the computer 3 Wait 5 seconds after powering down the computer before disconnecting a peripheral from the computer or removing a component from the computer s system board to avoid possible damage to the system board Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available peri
42. board Also set the jumpers on the new system board so that they are identical to those on the old board unless a microprocessor upgrade is being installed If the original system board has a NIC connector ensure that the replacement board has a NIC connector When you reinstall the system board before you slide the system board back to lock it in position push down near each slot to engage the grounding clip Dell OptiPlex G1 Managed PC Systems Service M anual onto its corresponding tab Push evenly on both sides of the system board as you Slide it into position do not twist the system board System Board Components The subsections that follow Figure 5 18 contain procedures for removing replacing system board components optional NIC connector serial port 2 ENET microprocessor video connector fan connector connector SERIAL2 mouse keyboard MONITOR FAN USB connectors 2 pen ba E USB stacked MOUSE KYBD i parallel serial port 1 CPI a connectors stacked PARALLEL SERIAL1 video memory upgrade socket SEC cartridge connector VIDEO_UPGRADE SLOT1 ATI multimedia CONNECTOR AME DIMM sockets 2 DIMM A DIMM B riser board connector RISER main power input secondary EIDE connector POWER 1 interface connector IDE2 NAAN ed cad input PERE ER c battery socket BATTERY system board primary EIDE diskette tape drive chassis intrusio
43. d each procedure assumes the following e You have performed the steps in Precautionary Measures found later in this chapter e You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of one or more of the following tools Small flat blade screwdriver Wide flat blade screwdriver 1 and 2 Phillips screwdrivers 1 4 inch nutdriver Tweezers or long nose pliers Also use a wrist grounding strap as explained in the next section Precaution ary Measures Removing and Replacing Parts on the Mini Tower Chassis 6 1 6 2 Precautionary Measures Before you perform any of the procedures in this chapter take a few moments to read the following waming for your personal safety and to prevent damage to the system from ESD WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system perform the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also disconnect any telephone or telecommunication lines from the computer 3 Wait 5 seconds after powering down the computer before disconnecting a peripheral from
44. d is active incorporating PCI to PCI bridging System Overview 1 13 The mini tower riser board includes the P1 connector for connecting the NIC to the riser board cable and an LED If the LED is on the riser board is receiv ing power if off the riser board is not receiving power ISA4 LED m ISA3 a saa ISA2 aaa m C LC ie oo i ISA1 P1 connector l ED Pele HDLED PCI1 connector Figure 1 10 Riser Board for the Mini Tower Computer Upgrade Options The system board can accommodate the following system upgrades e Microprocessor upgrade Main memory expansion e Video memory expansion These upgrades are summarized in the following subsections and installation procedures are provided for the various chassis configurations in Chapters 4 5 and 6 Microprocessor L2 Cache Upgrades The microprocessor and secondary L2 cache memory are implemented in an SEC cartridge heat sink assembly Upgrade to a higher performance micro processor is accomplished by snapping out the old assembly and installing an upgrade assembly as higherperformance microprocessors become available Main Memory Expansion The two DIMM sockets on the system board can accommodate combinations of 32 64 and 128 MB 64 bit nonparity DIMMs up to a total memory capac ity of 256 MB l 14 Dell OptiPlex G1 Managed PC Systems Service Manual Video Memory Upgrade Opti
45. dition If the system emits a beep code see Table 3 1 5 Observe the monitor screen for the Diagnostics Menu Does the Diagnostics M enu appear Yes See Running the System Diagnostics found later in this chapter No Proceed to step 6 6 Turn off the system insert a copy of the Dell Diagnostics Diskette into the diskette drive and then reboot the system Does the Diagnostics M enu appear Yes See Running the System Diagnostics found later in this chapter No Proceed to the next section Internal Visual Inspection Internal Visual Inspection CAUTION Before you proceed with the internal visual inspection 1 described in this section ensure that the user has saved all open files and exited all open applications if possible A simple visual inspection of a computer s interior hardware can often lead to the source of a problem such as a loose expansion card cable connector or mounting screw When you perform the visual inspection refer to Figures 1 3 through 1 5 as appropriate for your system for component location information To perform the internal visual inspection follow these steps 1 Turn off the system including any attached peripherals and dis connect all the AC power cables from their power sources 2 Remove the computer cover 24 Dell OptiPlex G1 M anaged PC Systems Service M anual A 3 Verify that all chips DIMMs and expansion cards are fully seated in their sockets or connectors WARN
46. e Ake RUE EUR RR Ue RUP de Voc Vo od IC Disabled Wakeup On LAN 154365040443444 000300 res e o tisi RR RS Off Power Management x eins eu ree i pee x e ahs cde eere BA Disabled ASSOC TAT u AG Ara B88 Bi eue tee Ies dte kes NG Homes ASSET TAG Ay to select X SPACE to change ESC to exit F1 Help key functions Figure A 1 System Setup Screen Dell OptiPlex G1 Managed PC Systems Service Manual Table A 1 System Setup Options Option Function System Time Resets time on computer s internal clock System Date Resets date on computer s internal calendar Diskette Drive A Diskette Drive B Identifies type of diskette drives installed Options always match physical locations of drives in computer Tape drives are not reflected in these options Primary Drive n Secondary Drive n Identifies drives attached to the IDE1 and IDE2 connectors on system board Each EIDE con nector supports two EIDE drives Drive 0 and Drive 1 For EIDE hard disk drives the system provides an automatic drive type detect feature To use this feature highlight the appropriate Drive option press lt Enter gt and then type a for automatic If none of the supported drive types matches the parameters of the new drive enter parameters directly To do so highlight the appropriate Drive option Drive 0 or Drive 1 press lt Enter gt and then type u to display User1 Press Tab to highlight each of the parameter fields in successio
47. e IF P control panel mounting tab Figure 4 6 Control Panel Removal To remove the control panel follow these steps 1 Disconnect the control panel cable from the PANEL connector on the system board see Figure 4 16 2 From the inside of the chassis remove the mounting screw hold ing the control panel to the chassis 3 Remove the control panel from the chassis When you reinstall the control panel be sure to put the right side of the control panel behind the mounting tab 4 8 Dell OptiPlex G1 M anaged PC Systems Service Manual Drives Figure 4 6 shows an example of drive hardware that can be installed in the computer Refer to this figure when you perform any of the procedures in the following subsections diskette tape drive interface cable 3 5 inch diskette drive DC power cable 5 25 inch drive bay and bracket power supply Na hard disk drive EIDE cable primary EIDE interface connector IDE1 DSKT connector connector IDE2 Figure 4 7 Drive Hardware Removing and Replacing Parts on the Low Profile Chassis 49 Externally Accessible Drive Assemblies The following subsections contain removal replacement procedures for drives installed in the externally accessible drive bays 3 5 Inch Diskette Drive Assembly drive mounting screws 2 3 5 inch diskette drive assembly ae V d latches 2 front of computer hooks 2 Figure 4 8 3 5 Inch Diskette Drive Removal To
48. e System User s Guide 2 6 Dell OptiPlex G1 M anaged PC Systems Service Manual CHAPTER 3 Beep Codes and Error Messages This chapter describes the beep codes and error messages that are common to all members of the Dell OptiPlex G1 Managed PC family of computers These error messages can occur during the POST or in the case of some fail ures during normal system operation The tables in this chapter list faults that can cause a beep code or system error message to occur and the probable causes of the fault in each case If a faulty system does not emit beep codes or display system error messages to indicate a failure you should use the system diagnostics to run the appropri ate tests to help isolate the source of the problem see Running the System Diagnostics in Chapter 2 POST Beep Codes If the monitor cannot display error messages during the POST the system may emit a series of beeps that identifies the problem or that can help you identify a faulty component or assembly Table 3 1 lists the beep codes that may be generated during the POST Most beep codes indicate a fatal error that pre vents the system from completing the boot routine until the indicated condition is corrected When the system emits a beep code record the code and then find it in Table 3 1 If the table does not lead to the source of the problem run the appropriate tests in the system diagnostics to assist in troubleshooting the problem Table 3 1 P
49. e ok 1 3 SMART Technology 2x Ee eR ES ER ie late wile ea an 1 3 Integrated Diskette Tape Drive Controller 0 0 0c eee eee 1 4 Integrated SVGA Subsystem sananne 1 4 ATI Multimedia Channel 0 000 cece eee eee eens 14 Chassis Intrusion Detection iii nma boxe XGA 1 5 Integrated Ethemet NIC Support Optional 1 5 Network Cable Requirements 00 0 cece nee eens 1 5 F l Setof NO PONG oov adan owe Recah eRe rome te rue YE 1 6 Power SUDDIVas Mea eec M rera sae PIE eater RE 1 6 Location of Major Components 0 cee eee eee 1 7 Component Orientation eaaa es 1 11 Advanced Expansion Features 0 0 cece eee tees 1 12 Low Profile Computer s Expansion Card Slots 1 12 Midsize Computer s Expansion Card Slots 00005 1 12 Mini Tower Computer s Expansion Card Slots 1 13 Upgrade OptOls seem NG Nka a eos RAPERE EIE 1 14 Microprocessor L2 Cache Upgrades aaa 1 14 Main MemorEXpanSi0oN 248s 5 9 oa aan pa aee treet oh alata ea t 1 14 Video M emory Upgrade Option 0 eee ee 1 15 Computer Service Information 0 00 2 0 cee eee eee 1 15 Remote Management Support Features Optional 1 15 Online Documentation iure BY xu e ER RE ERR Ea 1 15 System DiIagnOSUCS 2s esu tura OX ea uS Ed Nie 1 15 Chapter 2 Chapter 3 Chapter 4 System Board Service Data ccc eee eens 1 16 Sy
50. e that came with the system Dell provides the Diagnostics and Troubleshooting Guide for troubleshooting procedures and instructions on using the Dell diagnostics to test the computer system Warnings Cautions and Notes Throughout this manual there may be blocks of text printed in bold type or in italic type These blocks are wamings cautions and notes and they are used as follows WARNING A WARNING indicates the potential for bodily harm and provides instructions for how to avoid the problem CAUTION A CAUTION indicates either potential damage to hard ware or loss of data and provides instructions for how to avoid the problem NOTE A NOTE provides helpful information about using the computer system CHAPTER 1 System Overview This manual contains field servicing information for the Dell OptiPlex G1 Managed PC family of computers The Dell OptiPlex G1 systems are high speed 266 300 333 350 or 400 M Hz upgradable desktop computers built around high performance Intel Pentium II microprocessors with MMX technology The OptiPlex G1 systems use a Dell designed system board with an optional integrated NIC controller with Wakeup On LAN capability The OptiPlex G1 systems are available in three different chassis configurations low profile desktop midsize desktop and mini tower See Figure 1 1 Chapters 1 through 3 and Appendix A contain information that applies to all models of the OptiPlex G1 family Cha
51. em 5 VDC 5 VDC ISA1 power supply 5 VDC 5 VDC 5 VDC through 12 VDC 12 VDC 12 VDC ISA4 12 VDC 12 VDC POWER2 12 VDC p2 main internal memory PANEL hard disk drive sockets intemal Pa NB hard disk drive P4 KYBD 3 5 inch diskette drive MOUSE P5 processor MICROPROCESSOR core regulator drive 43 3 VDC P6 optional COrE VCC F21 ot VDE NOTE 5 VFP is routed to drive the optional integrated NIC P9 logic on the system board optional aai P1 on the riser drive f Figure 1 20 DC Power Distribution for the Mini Tower Computer System Overview 1 27 Technical Specifications Table 1 5 Technical Specifications Microprocessor Microprocessor type Microprocessor speed External system clock Intemal cache Math coprocessor Intel Pentium II microprocessor with MM X technology 266 300 333 350 or 400 MHz 66 100 MHz 32 KB 16 KB data cache and 16 KB instruc tion cache internal to the microprocessor System Information System chip set Data bus width Address bus width DMA channels Interrupt levels Flash EPROM BIOS Intel 440BX PIIX4e chip set 64 bits 32 bits eight 15 2Mb Expansion Bus Bus types Bus speeds PCI expansion card connectors Low profile computers Midsize computers Mini tower computers PCI
52. em and the conditions under which it occurs In particular was the user installing new hardware or software when the failure occurred A verbal description can often indicate the cause of a problem or indicate the appropri ate troubleshooting procedure to use After the user describes the problem follow these steps 1 Ask the user to back up any data on the hard disk drive if the system s condition permits See Maintaining the System in the online System User s Guide for infor mation about backing up data 2 Ask the user to try to duplicate the problem by repeating the oper ations he or she was performing at the time the problem occurred Can the user duplicate the problem Yes Proceed to step 3 No Proceed to the next section Extemal Visual Inspection 3 Observe the user to determine if he or she is making an error such as typing an incorrect key combination or entering a com mand incorrectly Is the problem a result of user error Yes Instruct the user in the proper procedure or direct him or her to the appropriate user documentation for the correct procedure No Proceed to the next section Extemal Visual Inspection Basic Troubleshooting 21 External Visual Inspection The external visual inspection consists of a quick inspection of the exterior of the computer the monitor the keyboard any peripherals and cables While performing the visual inspection make any necessary corrections To perform
53. engage the grounding clip Removing and Replacing Parts on the Low Profile Chassis 4 17 4 18 onto its corresponding tab Push evenly on both sides of the system board as you Slide it into position do not twist the system board System Board Components The subsections that follow Figure 4 16 contain procedures for removing replacing system board components serial port 2 microprocessor connector SERIAL2 video connector fan connector DM ag optional NIC MONITOR FAN USB connectors 2 stacked connector USB MOUSE KYBD ENET a Soa parallel serial port 1 connectors stacked L A PARALLEL SERIAL1 video memory upgrade socket SEC cartridge connector VIDEO_UPGRADE SLOT1 ATI multimedia ae CEMENT AMG DIMM sockets 2 4 DIMM A DIMM B riser board connector RISER main power input secondary EIDE 2222122222 connector POWER 1 interface P ESL 3 3 V power input connector IDE2 PE SOS connector Emm El 2 i ee socket BATTERY system board primary EIDE diskette tape drive chassis intrusion switch Jumpers re connector ee connector connector INTRUSION control panel font ofcom connector PANEL Figure 4 16 System Board Components DIMMs To remove a DIMM from one of the two DIMM sockets follow these steps 1 Locate the two DIMM sockets see Figure 4 15 2 To remove a DIMM push outward on the DIMM socket s
54. er 6 11 E EIDE subsystem 1 3 eject button removal low profile computer 4 6 midsize computer 5 6 mini tower computer 6 6 error messages 3 3 Ethernet NIC subsystem 1 5 expansion features 1 12 expansion card cage removal low profile computer 4 14 midsize computer 5 15 mini tower computer 6 16 expansion card removal low profile computer 4 15 midsize computer 5 16 mini tower computer 6 17 expansion card slots low profile computer 1 12 midsize computer 1 12 mini tower computer 1 13 extemal connectors low profile computer 1 8 midsize computer 1 9 mini tower computer 1 10 extemal visual inspection 2 2 F flash ROM 1 3 front bezel removal mini tower computer 6 5 front panel features 1 7 front panel insert removal low profile computer 4 7 midsize computer 5 7 mini tower computer 6 7 Index 3 H hard disk drives bracket removal midsize computer 5 12 bracket removal mini tower computer 6 13 options 1 20 removal low profile computer 4 12 removal midsize computer 5 13 removal mini tower computer 6 14 service information 1 20 SMART technology 1 3 heat sink SEC cartridge assembly See SEC cartridge heat sink assembly help getting 2 6 I I O ports 1 6 indicators See controls and indicators intemal view low profile computer 1 8 4 3 midsize computer 1 9 5 3 mini tower computer 1 10 6 3 internal visual inspection 2 4 interrupt ass
55. er and align the cap tive thumbscrew in the stand with the screw hole in the cover Removing and Replacing Parts on the M idsize Chassis 5 3 54 m ge S Figure 5 2 Attaching the Optional Stand for Vertical Orientation As you lower the stand into place make sure that the locator pin see Figure 5 2 fits into the comer hole of the hole pattem as shown When the stand is in place tighten the thumbscrew 3 Rotate the computer so that the stand is at the bottom and the drives are at the top To remove the stand tum the computer over so the stand is at the top loosen the screw and lift the stand away and then place the computer in a horizontal position Dell OptiPlex G1 Managed PC Systems Service Manual Computer Cover securing 7 Ng P di N EZ a sh 333 33 933 33389 C 3353993 3333333 3 5 p front of computer Figure 5 3 Computer Cover Removal To remove the computer cover follow these steps 1 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 2 Press in on the two securing buttons until the cover is free to swing up 3 Raise the back of the cover and pivot it toward the front of the computer 4 Lift the cover off the hooks at the front of the chassis Four plastic hooks on the inside front part of the cover secure it to the chassis Before you reinstall the cover fold all cables out of the way so that they do not inte
56. er use your thumbs to push inward on the insert until it slides off the two posts To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening and then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to help push on the ring tabs Removing and Replacing Parts on the Midsize Chassis 5 7 Control Panel chassis hooks 2 gt 4 5 Gea screw control panel control panel cable Figure 5 6 Control Panel Removal To remove the control panel follow these steps 1 Remove the hard disk drive bracket 2 Disconnect the control panel cable from the PANEL connector on the system board see Figure 5 18 3 Remove the mounting screw holding the control panel to the chassis 4 Slide the control panel out of the hooks holding it to the chassis Note the routing of the control panel cable as you remove it from the chassis 5 8 Dell OptiPlex G1 Managed PC Systems Service Manual Drives Figure 5 7 shows an example of drive hardware that can be installed in the computer Refer to this figure when you perform any of the procedures in the following subsections system a pees diskette tape drive power cable interface cable supply 3 5 inch diskette hae drive 3 hard disk drive bracket EIDE cable primary EIDE interface connector IDE 1 DSKT connector secondary EIDE interface connector IDE2 Figure 5 7 Drive Hardware Ex
57. ese steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Slide the expansion card cage out of the computer To replace the expansion card cage align the tabs on the left and right sides of the expansion card cage with the slots on the back and bottom of the chassis With the securing lever in its extended position slide the expansion card cage into place 6 16 Dell OptiPlex G1 Managed PC Systems Service Manual Expansion Card expansion card card slot retaining screw opening U card mounting Ng bracket IB riser board expansion card connector Figure 6 16 Expansion Card Removal To remove an expansion card follow these steps 1 2 3 4 Disconnect any cables from the expansion card being removed Remove the expansion card cage Remove the retaining screw from the card mounting bracket Grasp the expansion card by its corners and carefully remove it from the expansion card connector Removing and Replacing Parts on the Mini Tower Chassis 6 17 Riser Board riserboard riser board mounting screws AN O expansion card cage Figure 6 17 Riser Board Removal To remove the riser board follow these steps 1 Remove the expansion card cage and all expansion cards 2 Place the expansion card cage on a flat work surface with the riser board facing up 3 Remove the riser board mounting screws 4 Slide the riser board away
58. expansion card cage NIC connector optional system board CRY riser board padlock ring Figure 1 5 Internal View of the Mini Tower Chassis Dell OptiPlex G1 Managed PC Systems Service M anual hard disk drive chassis intrusion Component Orientation Throughout this manual references to component locations assume the chas sis orientations illustrated in Figure 1 6 right side hard disk Hit removable drive media device j hard disk a NG aaa 4 drive front front Low Profile Computer Midsize Chassis top a diskette drive l removable media device bottom Mini Tower Chassis Figure 1 6 Computer Orientation Information System Overview 1 11 Advanced Expansion Features The OptiPlex G1 systems contain advanced expansion subsystems that can support a mixture of traditional ISA expansion cards called legacy cards Plug and Play ISA expansion cards and PCI expansion cards For non Plug and Play operating system environments an ISA Configuration Utility ICU included with the computer provides a means of avoiding resource conflicts Chapter 3 Using the ISA Configuration Utility in the Reference and Installation Guide describes the ICU and provides instructions for using it to configure the computer In the Microsoft Windows 95 operating system the functions provided by the ICU are handled by the Device Manager which can be accessed by double clicking the System icon i
59. grated diskette tape drive controller PIIX4e that can support a maximum of two non EIDE diskette and tape drives via a 34 pin DSKT connector located on the system board The low profile chassis can accommodate only one extemal drive device diskette drive or tape drive Other chassis configurations can accommodate two external drive devices NOTE If the diskette drive and tape arive are both attached to the diskette eX drive controller on the system board only the diskette drive is configured in the System Setup program as Drive A or Drive B The tape drive is then listed as Not Installed under either the Drive A or Drive B category Integrated SVGA Subsystem The OptiPlex G1 systems include an integrated high performance 64 bit base line accelerated graphics port AGP subsystem implemented on the system board which drives an external SVGA monitor The AGP contains a dedicated bus that bypasses the PCI bus and allows for interconnection of the video sub system directly to the Pentium II chip set for the extra high performance required for 3D video subsystems This architecture also off loads the PCI bus providing greater performance for devices attached to the PCI bus The maximum supported resolutions include 1600 x 1200 pixels with 256 col ors noninterlaced and 1024 x 768 pixels with 65 536 colors noninterlaced The SVGA subsystem consists of the following major components ATI Rage Il C baseline AGP 1X video controller e
60. gs 4 2 5 2 6 2 Printed in Malaysia P N 6562C
61. gure 1 7 Option 2 is an active riser 1 12 Dell OptiPlex G1 Managed PC Systems Service Manual board with a PCI to PCI bridge Option 2 has two ISA expansion card connec tors and five PCI expansion card connectors Two PCI ISA expansion card connector pairs each share an expansion card slot again resulting in a total of five expansion card slots see Figure 1 8 Both riser board options include the P1 connector for connecting the NIC to the riser board cable and an LED If the LED is on the riser board is receiving power if off the riser board is not receiving power ISA3 connector LED L 5 a connector ee ISAI 8 8 connector F 4 _1 __ PCI connector P1 connector PCI2 connector PCI1 connector HDLED connector In uu Figure 1 8 Riser Board for the Midsize Computer Option 1 PCI5 L ED m connector S PCI4 a SS PM connector M 4 gt PCI3 connector HDLED 48 P1 connector connector oral PCI2 connector PCI1 connector Figure 1 9 Riser Board for the Midsize Computer Option 2 Mini Tower Computer s Expansion Card Slots The mini tower computers have seven expansion card slots The riser board has four ISA expansion card connectors and five PCI expansion card connec tors Two PCI expansion card connectors share expansion card slots with two ISA connectors resulting in a total of seven expansion card slots see Figure 1 9 The riser boar
62. he battery only with the same or equivalent type recommended by the manufacturer Dis card used batteries according to the manufacturer s instructions 6 Insert the battery into the socket with the positive side labeled facing upwards and snap it into place 7 Replace the expansion card cage reconnect all cabling replace the computer cover and reboot the system 8 Enter the System Setup program and configure the system using the information from the printouts you made earlier 9 Turn off the computer and wait 10 minutes Then reenter the Sys tem Setup program to ensure that the date and time are still correct indicating that the system battery is functioning correctly Removing and Replacing Parts on the Low Profile Chassis 4 23 4 24 Dell OptiPlex G1 Managed PC Systems Service Manual CHAPTER 5 Removing and Replacing Parts on the Midsize Chassis This chapter provides procedures for removing the components assemblies and subassemblies in the Dell OptiPlex G1 midsize computer If you are servic ing a low profile or mini tower chassis use Chapter 4 or 6 as appropriate for your system Unless otherwise noted each procedure assumes the following e You have performed the steps in Precautionary Measures found later in this chapter e You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional inform
63. he chassis when the lever is depressed If reinstalling an ISA expansion card into the expansion card cage be sure to Slip the end of the ISA expansion card into the plastic ISA expansion card end support The ISA expansion card end support should not be removed how ever if it is accidentally removed reinstall it by first inserting its top tab into the side support hole and then sliding the bottom two tabs into the two support holes on the chassis floor 4 14 Dell OptiPlex G1 Managed PC Systems Service Manual Expansion Card retaining screw expansion card card mounting bracket A HZ UA bbli expansion card connector riser board Figure 4 13 Expansion Card Removal To remove an expansion card follow these steps 1 Disconnect any external cables from the expansion card being removed 2 Remove the expansion card cage 3 Remove the retaining screw from the card mounting bracket 4 Grasp the expansion card by its corners and carefully remove it from the expansion card connector Removing and Replacing Parts on the Low Profile Chassis 4 15 Riser Board riserboard mounting screws 2 IE P riser board alignment Figure 4 14 Riser Board Removal To remove the riser board follow these steps 1 Remove the expansion card cage and all expansion cards 2 Lay the expansion card cage on a flat work surface with the riser board facing up 3 Remove the two riser board mounting screws
64. he heat sink assembly until the latches click 5 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the SEC cartridge release latches out ward to lock the assembly onto the metal standoffs System Battery battery BATTERY socket Figure 5 23 System Battery Installation To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details Removing and Replacing Parts on the Midsize Chassis 5 23 2 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 3 Remove the computer cover 4 Remove the expansion card cage and locate the battery in the front right corner of the system board adjacent to the DIMM con nectors see Figure 5 18 CAUTION If you pry out the battery with a blunt object be careful A not to touch the system board with the object Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery Otherwise you may damage the system board by prying off the socket or by breaking traces on the system board 5 Remove
65. he three Dell OptiPlex G1 chassis See Running the System Diagnostics in Chapter 2 for additional information System Overview 1 15 1 16 System Board Service Data The following subsections provide service related information about the sys tem board and components System Board The OptiPlex G1 systems are equipped with a standard system board inte grated NIC is optional serial port 2 microprocessor connector SERIAL2 video connector fan connector mouse keyboard connectors stacked Hapag ba IC MONITOR FAN USB connectors 2 MOUSE B D ENET in t parallel serial port 1 connectors stacked PARALLEL SERIAL1 video memory upgrade socket SEC cartridge connector VIDEO_UPGRADE SLOT1 ATI multimedia channel connector AM C DIMM sockets 2 DIMM_A DIMM_B riser board connector RISER main power input connector POWER 1 secondary EIDE interface 3 3 V power input ies ee H connector POWER_2 battery paa e BATTERY board Te primary EIDE diskette tape drive chassis intrusion switch interface connector interface connector connector INTRUSION IDE1 DSKT control panel front of computer connector PANEL Figure 1 11 System Board Components Dell OptiPlex G1 Managed PC Systems Service Manual System Board Jumpers jumpered unjumpered mal mal TI pa Figure 1 12 System Board Jumpers Table
66. ideo monitor controls see the documentation for the monitor Inspect the keyboard to ensure that no keys are sticking If one or more keys are sticking it may be necessary to replace the keyboard 22 Dell OptiPlex G1 M anaged PC Systems Service M anual 8 Inspect the exterior of the computer including all controls and indicators and all user accessible data storage devices for any signs of physical damage Does the inspection reveal any problems Yes Refer to the parts removal and replacement procedure in Chapters 4 5 or 6 aS appropriate for your system No Proceed to the next section Observing the Boot Routine Observing the Boot Routine After you have performed an external visual inspection as described in the pre vious section you should boot the system and while the boot routine is running observe the system for any indications of problems CAUTION To prevent damage to the original diagnostics diskette always use a backup copy of the diagnostics diskette when servicing a user s computer Dell recommends that users make several copies of the original diskette to ensure that one is always available NOTE Most of the steps in this procedure require observation of system func tions and indications some of which can occur simultaneously It may be necessary to reboot the system several times in order to complete all of these steps To observe problem indications during the boot routine follow these step
67. ignments list of 1 18 ISA expansion card connectors low profile computer 1 12 midsize computer 1 12 mini tower computer 1 13 J jumpers 1 17 K key to enter System Setup program A 1 Dell OptiPlex G1 Managed PC Systems Service Manual M main memory 1 3 1 14 memory subsystem expansion using DIMMs 1 14 flash ROM 1 3 main memory 1 3 secondary L2 cache 1 3 1 14 video memory 1 4 1 15 messages error 3 3 microprocessor about 1 2 removal low profile computer 4 21 removal midsize computer 5 22 removal mini tower computer 6 23 N network cable requirements 1 5 NIC connector indicators 1 5 controller 1 5 support optional 1 5 O online documentation 1 15 optional stand for vertical orientation attaching low profile computer 4 4 attaching midsize computer 5 3 removal low profile computer 4 4 removal midsize computer 5 4 options upgrade 1 14 P PCI expansion card connectors low profile computer 1 12 midsize computer 1 12 mini tower computer 1 13 pin assignments DC power connectors 1 22 Plug and Play expansion cards 1 12 ports on back of low profile computer 1 8 on back of midsize computer 1 9 on back of mini tower computer 1 10 POST beep codes 3 1 power button removal low profile computer 4 6 midsize computer 5 6 mini tower computer 6 6 power distribution diagram low profile computer 1 24 midsize computer 1 26 mini tower computer 1
68. ilure Faulty video subsystem defective system board 4 2 1 4 2 2 4 2 3 4 2 4 No timer tick Shutdown failure Gate A20 failure Unexpected interrupt in protected mode Defective system board 4 3 1 Memory failure above address OFFFFh Faulty or improperly seated DIMM 4 3 3 Timerchip counter 2 failure Defective system board Dell OptiPlex G1 Managed PC Systems Service Manual Table 3 1 POST Beep Codes continued Beep Code Error Probable Causes 4 3 4 Time of day clock stopped Bad battery or defective system board 4 4 1 Serial port test failure Faulty I O chip defective system board 4 4 2 Parallel port test failure Faulty system board 4 4 3 Math coprocessor failure Faulty microprocessor chip or system board 4 4 4 Cache test failure Defective microprocessor or system board System Error Messages System error messages typically are presented on the screen during the POST but can occur any time an error is detected by the system System messages are very useful in troubleshooting the system Some of these messages require operator intervention to solve others indicate fatal errors that must be solved before the system will reboot Table 3 2 lists the system error messages that can occur and the probable cause for each message Table 3 2 System Error Messages Message Definition Probable Causes Address mark not found BIOS found faulty disk secto
69. ion Card Cage Removal 4 14 Expansion Card Removal 4 15 Riser Board Removal 4 16 System Board Removal 15 2 ERR Re 4 17 System Board Components 0000e eae 4 18 DIMM Removal nunana BAT ARN e t Ede edu 4 19 DIMM Installation seen 4 19 Installing a Video M emory Upgrade Module 4 19 SEC Cartridge Heat Sink Removal 4 21 System Battery Installation 0 000 000 4 22 Internal View of the Midsize Computer 5 3 Attaching the Optional Stand for Vertical Orientation 54 Computer Cover Removal aaa 5 5 Eject Power and Reset Button Removal 5 6 Front Panel Insert Removal 00000 cee eae 5 7 Figure 5 6 Figure 5 7 Figure 5 8 Figure 5 9 Figure 5 10 Figure 5 11 Figure 5 12 Figure 5 13 Figure 5 14 Figure 5 15 Figure 5 16 Figure 5 17 Figure 5 18 Figure 5 19 Figure 5 20 Figure 5 21 Figure 5 22 Figure 5 23 Figure 6 1 Figure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 7 Figure 6 8 Figure 6 9 Figure 6 10 Figure 6 11 Figure 6 12 Figure 6 13 Figure 6 14 Figure 6 15 Figure 6 16 Figure 6 17 Figure 6 18 Figure 6 19 Figure 6 20 Figure 6 21 Control Panel Removal 00 000 cee ee eee eee 5 8 Drive Hardware 2a nka NG SGY GNG KEY x REA baw es 5 9 3 5 Inch Diskette Drive Removal 0000005 5 10 5 25 Inch Drive Assembly Rem
70. ip defective system board Write faul Write faul C On selected drive MS DOS cannot write to diskette or hard disk drive Faulty diskette or hard disk drive Beep Codes and Error Messages 37 3 8 Dell OptiPlex G1 Managed PC Systems Service Manual CHAPTER 4 Removing and Replacing Parts on the Low Profile Chassis This chapter provides procedures for removing the components assemblies and subassemblies in the Dell OptiPlex G1 low profile computer If you are ser vicing a midsize or mini tower chassis use Chapter 5 or 6 as appropriate for your system Unless otherwise noted each procedure assumes the following e You have performed the steps in Precautionary Measures found later in this chapter e You have removed the computer cover You can replace or reinstall a part by performing the removal procedure in reverse order unless additional information is provided Recommended Tools Most of the procedures in this chapter require the use of one or more of the following tools Small flat blade screwdriver Wide flat blade screwdriver 1 and 2 Phillips screwdrivers 1 4 inch nutdriver Tweezers or long nose pliers Also use a wrist grounding strap as explained in the next section Precaution ary Measures Removing and Replacing Parts on the Low Profile Chassis 4 1 42 Precautionary Measures Before you perform any of the procedures in th
71. is chapter take a few moments to read the following waming for your personal safety and to prevent damage to the system from ESD WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the system perform the following steps in the sequence listed 1 Turn off the computer and any attached peripherals 2 Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury Also disconnect any telephone or telecommunication lines from the computer 3 Wait 5 seconds after powering down the computer before disconnecting a peripheral from the computer or removing a component from the computer s system board to avoid possible damage to the system board Wear a wrist grounding strap and clip it to an unpainted metal sur face such as the padlock loop on the back of the chassis If a wrist grounding strap is not available periodically touch an unpainted metal surface on the back of the computer to discharge any static charge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex G1 M anaged PC Systems Service M anual Inside the Computer Figure 4 1 shows an intemal view of the interior of the low profile computer and identifies major components for orientation Refer to this illustration as needed when performing the component removal replacement
72. ke advantage of future options in processor speed and functionality you can replace the microprocessor on your system board with any Dell supported microprocessor upgrade The microprocessor upgrade kit is shipped with an SEC cartridge heat sink assembly which includes the microprocessor micro processor heat sink and L2 cache memory module You may also have to reseat or replace an SEC cartridge heat sink assembly during normal maintenance SEC Cartridge Heat Sink Assembly SEC cartridge release latches 2 heat sink SEC 9 heat sink cartridge securing clips 2 guide bracket assembly Y metal standoffs 2 Figure 5 22 SEC Cartridge Heat Sink Removal 5 22 Dell OptiPlex G1 Managed PC Systems Service Manual To remove the SEC cartridge heat sink assembly follow these steps WARNING The SEC cartridge heat sink assembly can get extremely hot during system operations Be sure that the assembly has had suf ficient time to cool before touching it 1 Locate the SEC cartridge heat sink assembly 2 Disconnect the microprocessor fan connector from the 3 pin connector on the system board labeled FAN located between the SERIAL2 connector and the MONITOR connector see Figure 5 18 3 Release the two securing clips near the base of the heat sink from the metal standoffs 4 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to t
73. ld not find tor not found particular sector on disk or requested sector defective Reset failed Disk reset operation Improperly connected failed diskette tape drive hard disk drive interface cable or power cable Sector not found MS DOS unable to locate sector on dis kette or hard disk drive Defective sectors on dis kette or hard disk drive Dell OptiPlex G1 Managed PC Systems Service Manual Table 3 2 System Error Messages continued Message Definition Probable Causes Seek error MS DOS unable to Defective diskette or locate specific track on hard disk drive diskette or hard disk drive Seek operation System could not find Faulty diskette or hard failed particular address mark disk drive on disk Shutdown System board chip Defective system board failure faulty Time of day clock stopped Backup battery low Defective battery or faulty chip defective sys tem board Time of set day not Time or date setting in System Setup program incorrect or system bat tery bad Incorrect Time or Date settings or defective sys tem battery Timer chip counter 2 failed Timer circuit on system board malfunctioning Defective system board Unexpected interrupt in protected mode Keyboard mouse con troller malfunctioning or one or more DIMMs improperly seated Improperly seated DIMMs or faulty key board mouse controller ch
74. le bays Low profile computers Midsize computers Mini tower computers one 3 5 inch bay for a 3 5 inch diskette drive one 5 25 inch bay for a removable media device one 3 5 inch bay for a 3 5 inch diskette drive two 5 25 inch bays for removable media devices one 3 5 inch bay for a 3 5 inch diskette drive three 5 25 inch bays for removable media devices System Overview 1 29 Table 1 5 Technical Specifications continued Drives continued Internal hard disk drive bays Low profile computers Midsize computers Mini tower computers one bay for a 1 inch high EIDE hard disk drive two bays for either one or two 1 inch high EIDE hard disk drives or one 1 inch high EIDE hard disk drive and one 16 inch high EIDE hard disk drive two bays for either one or two 1 inch high EIDE hard disk drives or one 1 inch high EIDE hard disk drive and one 16 inch high EIDE hard disk drive Video Video type Video memory Maximum video resolution integrated ATI Rage II C baseline AGP 1X graphics 2 MB SGRAM upgradable to 4 MB 1600 x 1200 pixels with 256 colors Ports Externally accessible Serial DTE Parallel PS 2 style keyboard PS 2 compatible MOUSE Les m ben rena Internally accessible EIDE hard disk drive Diskette drive AT
75. lled in the hard disk drive bracket 2 Remove the screw that secures the hard disk drive bracket to the drive cage in the chassis 3 Grasp the bracket and rotate it outward from the chassis until the sliding tab clears the slide rail on the drive cage 4 Lift up the hard disk drive bracket slightly to free the hinge tabs and remove it from the computer When you reinstall the hard disk drive bracket insert the bracket s hinge tabs into the chassis slot so that the tabs hook over the slot Then rotate the bracket toward the drive cage and fit the bracket s sliding tab onto the drive cage slide rail Removing and Replacing Parts on the Mini Tower Chassis 6 13 6 14 Hard Disk Drive drive mounting screws for sliding tab side mounted drive 4 __ A p cud hard disk drive bracket drive mounting screws for bottom mounted drive 4 eese Eh Figure 6 13 Hard Disk Drive Removal To remove the hard disk drive assembly follow these steps 1 2 Remove the hard disk drive bracket Remove the four screws that attach the hard disk drive to the hard disk drive bracket One hard disk drive attaches to the hard disk drive bracket at the sides of the drive The other hard disk drive attaches to the hard disk drive bracket at the bottom of the hard disk drive Slide the drive out of the hard disk drive bracket Dell OptiPlex G1 Managed PC Systems Service M anual System Power Supply power supply
76. lly remove it from the expansion card connector Dell OptiPlex G1 Managed PC Systems Service Manual Riser Board riserboard mounting screws 2 riser board Figure 5 16 Riser Board Removal To remove the riser board follow these steps 1 2 Remove the expansion card cage and all expansion cards On a flat work surface turn the expansion card cage over with the riser board facing up Remove the riser board mounting screws Slide the riser board down until it stops then lift the riser board away from the expansion card cage Removing and Replacing Parts on the Midsize Chassis 5 17 5 18 System Board Screw slots 5 tabs 5 Figure 5 17 System Board Removal To remove the system board follow these steps 1 Disconnect all cables from their connectors at the back of the computer Remove the expansion card cage Disconnect all cables from the system board Remove the screw that secures the system board to the bottom of the chassis Slide the system board toward the front of the chassis until it stops Carefully lift the system board out of the chassis be sure to lift evenly and not twist the system board NOTES If you are replacing the system board remove all DIMMs the video ex memory upgrade module if present the single edge contact SEC cartridge heat sink assembly and the guide bracket assembly from the old system board and install them on the replacement
77. m of the bracket Check the alignment of the computer cover around the 5 25 inch drive bezel Adjust the drive forward or backward on the bracket to align it Removing and Replacing Parts on the Low Profile Chassis 4 11 Hard Disk Drive Assembly hard disk drive mounting screws 4 tabs 2 SSS IK captive screw b notches 2 front of computer Figure 4 10 Hard Disk Drive Assembly Removal To remove the hard disk drive follow these steps 1 Disconnect the DC power cable and the interface cable from the back of the drive 2 Loosen the captive screw that secures the hard disk drive bracket to the chassis 3 Pivot the hard disk drive assembly up and lift it out of the chassis 4 Remove the four hard disk drive mounting screws that attach the hard disk drive to the hard disk drive bracket When you reinstall the hard disk drive assembly be sure that the tabs on the back of the mounting plate fully engage the notches on the chassis before you rotate the assembly into place 4 12 Dell OptiPlex G1 Managed PC Systems Service Manual System Power Supply power supply power supply mounting screw Figure 4 11 System Power Supply Removal To remove the system power supply follow these steps 1 2 Disconnect the AC power cable from the back of the power supply Disconnect the DC power cables from the system board and the drives Remove the power supply mounting screw at the back
78. minating Resource Conflicts Run ning the System Diagnostics and Getting Help Eliminating Resource Conflicts Devices within the computer may require dedicated memory spaces interrupt levels or DMA channels all of which must be allocated during installation of the devices Because a device may be installed at a different time it is possible that the same resource is assigned to two or more devices Resource conflicts can result in disorderly or erratic system operation or failure of the system to operate at all If you suspect that resource conflicts might exist check the system and reassign the resources as necessary Basic Troubleshooting 2 5 Running the System Diagnostics The OptiPlex G1 systems use diskette based diagnostics which contain tests to aid in troubleshooting all major components of the system CAUTION To prevent damage to the original diagnostics diskette 1 always use a backup copy of the diagnostics diskette when servicing a user s computer Dell recommends that users make several copies of the original diskette to ensure that one is always available To run the diskette based diagnostics follow these steps 1 Insert a copy of the Dell Diagnostics Diskette into the diskette drive Turn on all peripherals and the computer Starting the diagnostics causes the Dell logo to appear on the monitor screen followed by a message indicating that the diagnostics is loading Before the diagnostics loads
79. n and enter the appropriate number for each field NOTE For EIDE devices such as EIDE CD ROM drives and EIDE tape drives that are using the built in EIDE controller set the appropriate Drive option to Auto Hard Disk Drive Sequence Lists installed adapter cards and devices in the order they will be initialized Boot Sequence Lists the order of the devices from which the system attempts to boot System Memory Indicates the entire amount of installed mem ory detected in your system Video Memory Displays the amount of video memory detected in your system Reserved Memory Designates a region of system board memory that can be supplied by an expansion card This feature should not be enabled unless an expansion card that requires special address ing is installed CPU Speed Indicates processor speed at which system boots the processor s rated speed or a slower compatibility speed which disables cache System Setup Program A 3 Table A 1 System Setup Options Option Function Integrated Devices Configures the devices integrated into the sys tem board System Security Displays the current status of your system s password security feature and allows you to assign and verify a new password Keyboard NumLock Determines whether the system boots with the keyboard s Num Lock mode activated Report Keyboard Errors Enables or disables reporting of keyboa
80. n switch Jumpers interface connector interface connector connector INTRUSION IDE1 DSKT control panel Font of om connector PANEL Figure 5 18 System Board Components Removing and Replacing Parts on the Midsize Chassis 5 19 DIMMs To remove a DIMM from one of the two DIMM sockets follow these steps 1 Locate the two DIMM sockets see Figure 5 19 2 To remove a DIMM push outward on the DIMM socket s securing clips until the DIMM is released from its socket 3 NN Sum securing clips 2 5 1 Figure 5 19 DIMM Removal 3 Lift the DIMM away from the socket 4 Reinstall the replacement DIMM by pressing the DIMM fully into the socket and then closing the securing clips to lock the DIMM into the socket a z securing clips 2 1 Figure 5 20 DIMM Installation 5 Replace all assemblies and cables previously removed 5 20 Dell OptiPlex G1 Managed PC Systems Service Manual Video Memory notch gt m d video memory video memory upgrade socket upgrade module Figure 5 21 Installing a Video Memory Upgrade Module You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module in the video memory upgrade socket on the system board Adding additional video memory increases the system s video performance and provides additional modes for high resolution expanded color applications To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTIO
81. n the Control Panel See your Windows 95 documentation for instructions on using the Device M anager to manage resources and resolve conflicts Low Profile Computer s Expansion Card Slots The OptiPlex G1 low profile computers have three expansion card slots The riser board has two ISA expansion card connectors and two PCI expansion card connectors One PCI expansion card connector and one ISA expansion card connector share a single expansion card slot resulting in a total of three expansion card slots see Figure 1 6 The low profile computers have a passive riser board with no PCI to PCI bridge The riser board includes the P1 connector for connecting the NIC to the riser board cable and an LED see Figure 1 6 If the LED is on the riser board is receiving power if off the riser board is not receiving power LED Ba ee P1 connector Jg E ISA1 ISA2 connector connector E __ Eo PCI1 connector HDLED Figure 1 7 Riser Board for the Low Profile Computer Midsize Computer s Expansion Card Slots The OptiPlex G1 midsize computers have five expansion card slots The riser board is offered in two options Option 1 is a passive riser board with no PCI to PCI bridge Option 1 has three ISA expansion card connectors and three PCI expansion card connectors One PCI expansion card connector and one ISA expansion card connector share a single expansion card slot resulting in a total of five expansion card slots see Fi
82. nd Replacing Parts on the Midsize Chassis vr as Dl Recommended Tools 4r ek eI EE REPE A d Bes 5 1 Precautionary Measures xoa duni indt Bang NUN MEN ad ed IQ 5 2 Inside the Computer 0 00 0 cece le 5 3 Using the Optional Stand for Vertical Orientation 5 3 COImDLIEISE COVER pman ana WADA anxii RES DI PIS LAG ELS Rd Park 5 5 Eject Power and Reset Buttons eere 5 6 Front Panel Inserts 24 cce due ER XR Een REX EE Ye EE 5 7 Control Panel a6 e actos dett riceve ode iu em e recta aut 5 8 DINES vec dett pU UL DE mich Rad Ha Pet qd iet 5 9 Externally Accessible Drive Assemblies 0 a 5 9 3 5 Inch Diskette Drive Assembly 00000 cea 5 10 5 254nch Drive Assembly liliis ess 5 11 Hard Disk Drive Bracket ua anaana a 5 12 Hard Disk DIVE siie aroi Was a E EA A dat agde s 5 13 System Power SUpply 5 14 Expansion Cards nahawaan AA tou kee T E E E BE Wah I ERES 5 15 Expansion Card C09 Emang BALAT eieaa P A Na aa 5 15 EXpanpsiorC adde aac miie aena te AA Ei AA 5 16 Riser Board 252223 wr wu ays yak tek uA WEE REQUE 5 17 System Board oos chicane ceo Maul AA 5 18 System Board Components sa somites win Gn AT ad Pk bee wee estes 5 19 DIMM Secrecy eae an BANG ANAK Vath ho BATS Pans DEE CRE INE 5 20 VIGEOIM GITIODV ei Scots pea ee tiie Ree ewes eee MERE AnG 5 21 MICKODMOCESS OP srce ranes DD oe eae Hee re BL Good act eee we yaa 5 22 SEC Cartridge Heat Sink Assembly
83. ns 1 17 removal low profile computer 4 17 removal midsize computer 5 18 removal mini tower computer 6 19 service data 1 16 system diagnostics See diagnostics System error messages 3 3 Index 5 system power supply removal low profile computer 4 13 removal midsize computer 5 14 removal mini tower computer 6 15 System Setup program about A 1 key to enter A 1 options A 3 screen A 2 system See computer T tape drives controller 1 4 removal low profile computer 4 11 removal midsize computer 5 11 removal mini tower computer 6 11 technical specifications 1 28 tools recommended low profile computer 4 1 midsize computer 5 1 mini tower computer 6 1 troubleshooting beep codes 3 1 boot routine 2 3 diagnostics 2 6 error messages 3 3 extemal visual inspection 2 2 initial procedures 2 1 internal visual inspection 2 4 resource conflicts 2 5 service related information 1 15 Dell OptiPlex G1 Managed PC Systems Service Manual U upgrade options 1 14 v video memory controller 1 4 upgrade module installation low profile computer 4 19 upgrade module installation midsize computer 5 21 upgrade module installation mini tower computer 6 22 upgrading 1 15 visual inspection extemal 2 2 internal 2 4 voltage ranges 1 21 voltage selection switch AC low profile computer 1 8 midsize computer 1 9 mini tower computer 1 10 W Wakeup On LAN 1 5 warnin
84. odically touch an unpainted metal surface on the back of the computer to discharge any static charge from your body Avoid touching components and contacts on a card and avoid touching pins on a chip to prevent static electricity damage Dell OptiPlex G1 M anaged PC Systems Service M anual Inside the Computer Figure 5 1 shows an intemal view of the midsize computer and identifies major components for orientation Refer to this illustration as needed when per forming the component removal replacement procedures in this chapter 3 5 inch diskette drive extemal drive bays diskette tape drive interface cable hard disk drive bracket power supply hard disk drive interface cable system board expansion card cage Figure 5 1 Internal View of the Midsize Computer Using the Optional Stand for Vertical Orientation Dell offers an optional stand that you can attach to the computer for a mini tower vertical orientation Although you can attach and remove the stand at any time with a minimum of system disruption it is easiest to attach before you set up your computer and connect the back panel cables To attach the stand follow these steps 1 Turn the computer onto its right side so that the drive bays are at the bottom 2 Fit the stand onto what was the left side of the computer Position the stand as shown in Figure 5 2 Align the large round hole in the stand with the securing button on the side of the cov
85. of the chassis Slide the system power supply forward until it stops then lift it from the chassis When you replace the system power supply place it down inside the chassis and against the right side of the chassis Then slide the system power supply toward the back of the chassis and hook the tabs into the right side of the power supply WARNING The voltage selection switch located on the back of the power supply assembly must be set to the correct operating voltage 115 or 230 V before the power cable is plugged into an AC outlet Removing and Replacing Parts on the Low Profile Chassis 4 13 Expansion Cards The computer has a removable expansion card cage The expansion card cage contains the riser board and any installed expansion cards Dell recommends that you remove the expansion card cage first before removing or installing expansion cards If you are not removing any of the expansion cards leave the extemal cables attached to the expansion cards Expansion Card Cage expansion card cage ISA expansion card end support side support hole Figure 4 12 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep it flush against the chassis to ensure that the lever engages the notch in t
86. om of the cover allowing it to pivot up toward you 5 Disengage the tabs that secure the cover to the top of the chassis and lift the cover away Before you reinstall the cover fold all cables out of the way so that they do not interfere with the cover or with proper airflow inside the computer Z NOTE After removing and replacing the chassis the chassis intrusion detector alerts you that the cover has been removed Refer to Chassis Intrusion Detec tion in Chapter 1 for instructions on resetting the chassis intrusion detector 64 Dell OptiPlex G1 Managed PC Systems Service Manual Front Bezel tab release retaining hooks 2 Figure 6 3 Front Bezel Removal To remove the front bezel follow these steps 1 2 3 Press the tab release marked with the icon Tilt the bezel away from the chassis Disengage the two retaining hooks at the bottom of the bezel and pull the bezel away from the chassis Removing and Replacing Parts on the Mini Tower Chassis 6 5 Eject Power and Reset Buttons front bezel eject button B ol reset button Figure 6 4 Eject Power and Reset Button Removal To remove the eject power and reset buttons follow these steps 1 Lay the front bezel on a flat work surface with the back of the bezel facing up 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button
87. omputer 1 24 power distribution diagram midsize computer 1 26 power distribution diagram mini tower computer 1 27 service information 1 15 specifications technical 1 28 troubleshooting 2 1 upgrade options 1 14 connectors on back of low profile computer 1 8 on back of midsize computer 1 9 on back of mini tower computer 1 10 system board 1 16 control panel removal low profile computer 4 8 midsize computer 5 8 mini tower computer 6 8 controllers diskette tape drive 1 4 EIDE 1 3 Ethemet NIC 1 5 video 1 4 controls and indicators diskette drive access indicator 1 7 front panel views 1 7 hard disk drive access indicator 1 7 NIC activity indicator 1 5 NIC link integrity indicator 1 5 power button 1 7 power indicator 1 7 reset button 1 7 Dell OptiPlex G1 Managed PC Systems Service Manual cover removal low profile computer 4 5 midsize computer 5 5 mini tower computer 6 4 D DC power cables low profile computer 1 23 cables midsize and mini tower computers 1 25 connector pin assignments low profile computer 1 22 connector pin assignments midsize computer 1 22 connector pin assignments mini tower computer 1 22 distribution low profile computer 1 24 distribution midsize computer 1 26 distribution mini tower computer 1 27 voltage ranges 1 21 diagnostics system about 1 15 diskette based 1 15 2 6 running 2 6 server based 1 15 DIMMs installati
88. on You can upgrade video memory from 2 to 4 MB by installing an optional video memory upgrade module in the video memory upgrade socket on the system board Adding video memory increases the system s video performance and provides additional modes for high resolution expanded color applications NOTE See the online System User s Guide or Chapter 6 Installing System Board Options in the Reference and Installation Guide for additional upgrade information Computer Service Information The following subsections provide service related information about the com puter Unless otherwise specified the information applies to all chassis configurations Remote Management Support Features Optional For OptiPlex G1 systems equipped with the optional integrated Wakeup On LAN capable NIC the following tasks may be performed by a system adminis trator at a remote location e Perform computer setup processes Download and install software e Perform file updates e Perform asset tracking functions e Download and run the diagnostics over the network Online Documentation Dell OptiPlex G1 computers are shipped with an online System User s Guide located in the Dell Accessories folder that provides additional hardware and software installation configuration information and Dell contact information System Diagnostics Server based and diskette based diagnostics are available to aid in trouble shooting all major components of t
89. on low profile computer 4 19 installation midsize computer 5 20 installation mini tower computer 6 21 location on system board 1 16 removal low profile computer 4 19 removal midsize computer 5 20 removal mini tower computer 6 21 types and sizes 1 14 disk drives See diskette drives drives hard disk drives tape drives CD ROM drives diskette drives removal low profile computer 4 10 removal midsize computer 5 10 removal mini tower computer 6 11 diskette tape drive controller 1 4 diskette based diagnostics 2 6 DMA channel assignments 1 19 documentation online 1 15 drives 3 5 inch diskette drive removal low profile computer 4 10 3 5 inch diskette drive removal midsize computer 5 10 3 5 inch diskette drive removal mini tower computer 6 10 CD ROM drive removal low profile computer 4 11 CD ROM drive removal midsize computer 5 11 CD ROM drive removal mini tower computer 6 11 hard disk drive bracket removal midsize computer 5 12 hard disk drive bracket removal mini tower computer 6 13 hard disk drive removal low profile computer 4 12 hard disk drive removal midsize computer 5 11 hard disk drive removal mini tower computer 6 14 location low profile computer 4 9 location midsize computer 5 9 location mini tower computer 6 9 tape drive removal low profile computer 4 11 tape drive removal midsize computer 5 11 tape drive removal mini tower comput
90. on the World Wide Web www dell com The BIOS also incorporates the POST diagnostics which tests the system each time the system is started EIDE Subsystem The EIDE subsystem implemented on the system board provides two M ode 4 DMA bus mastered EIDE interfaces each of which can support up to two EIDE devices for example CD ROM drive hard disk drive and so on The EIDE controller attaches to the high speed PCI local bus The primary EIDE interface IDE1 provides support for up to two high performance EIDE devices The computer s boot drive should be connected to the primary EIDE interface The secondary EIDE interface IDE2 also provides support for up to two high performance EIDE devices typically EIDE tape drives or CD ROM drives NOTE The externally accessible drive bays at the front of the computer are normally used for diskette CD ROM and or tape drives Hard disk drives should be installed in the internal hard disk drive positions described in Hard Disk Drive Service Information found later in this chapter SMART Technology As a standard feature OptiPlex G1 systems are equipped with Self M onitoring and Analysis Reporting Technology SM ART which warns you at system start up if your hard disk drive has become unreliable This warning occurs only if you use hard disk drives with SM ART technology System Overview Integrated Diskette Tape Drive Controller The OptiPlex G1 systems are equipped with an inte
91. ough 1 20 provide the following information about DC power distribution e Powersupply connector identification e Power cable connections for diskette tape CD ROM and hard disk drives e Power distribution to sockets and connectors on the system board P1 Figure 1 16 DC Power Cables for the Low Profile Computer System Overview 1 23 1 24 optional drive 3 5 inch diskette drive intemal hard disk drive keyboard controller 3 VDC system board riser board battery power RTC management NVRAM I 3 3 VDC P1 and NIC logic 5 VDC PCI1 POWER1 z PCI2 PWRGOOD FIZ VDE PSON P1 45 VFP 45 VDC 45 VDC 5 VDC 5 VDC 5 VDC 5 VDC 12 VDC 12 VDC 12 VDC 2 12 VDC 12 VDC POWER2 12 VDC PANEL USB processor core regulator 3 3 VDC core VCC 2 1 to 3 5 VDC MICROPROCESSOR KYBD MOUSE NOTE 5 VFP is routed to the optional integrated NIC logic on the system board and to P1 on the riser board Figure 1 17 DC Power Distribution for the Low Profile Computer Dell OptiPlex G1 Managed PC Systems Service Manual r4 a Figure 1 18 DC Power Cables for the Midsize and Mini Tower Computers 1 25 System Overview 1 26 system power supply internal
92. oval 5 5 11 5 25 Inch Drive Removal anaana anaana 5 11 Hard Disk Drive Bracket Removal 5 12 Hard Disk Drive Removal 0 cece eens 5 13 System Power Supply Removal 2 0 0005 5 14 Expansion Card Cage Removal 5 15 Expansion Card Removal 0000 cee eee 5 16 Riser Board Removal 0 0000 cece eee eee 5 17 System Board Removal 00 ccc eee eee eens 5 18 System Board Components 0 aaa 5 19 DIMM Removal 2 22223 ex oma SEE SE TA 5 20 DIMM Installation 2 e rb E BARA ed Sere en ares 5 20 Installing a Video M emory Upgrade Module 5 21 SEC Cartridge Heat Sink Removal 5 22 System Battery Installation eee eee ee 5 23 Internal View of the Mini Tower Computer 6 3 Computer Cover Removal 0 000 cece eee eee 6 4 Front Bezel Removal 0 00 ccc eee ees 6 5 Eject Power and Reset Button Removal 6 6 5 25 Inch Front Panel Insert Removal 6 7 Control Panel Removal aa 6 8 Drive Hardware 0 0 cc eee ees 6 9 3 5 Inch Diskette Drive Assembly Removal 6 10 3 5 Inch Diskette Drive Bracket 6 11 5 25 Inch Drive Assembly Removal 5 6 11 5 25 Inch Drive Removal 00 ccc eee eee 6 12 Hard Disk Drive Bracket Removal 6 13 Hard Disk Drive Removal 0 cece
93. ove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate see Figure 5 10 Align the front of the drive flush with the tab at the front of the 5 25 inch drive mounting plate drive mounting screws 4 Figure 5 10 5 25 Inch Drive Removal Removing and Replacing Parts on the Midsize Chassis 5 11 When you replace the 5 25 inch drive align the front of the drive flush with the tab at the front of the mounting plate Insert the four screws and tighten them in the order stamped on the bottom of the 5 25 inch drive mounting plate Hard Disk Drive Bracket agd hard disk drive bracket Figure 5 11 Hard Disk Drive Bracket Removal To remove the hard disk drive bracket follow these steps 1 Disconnect the DC power cable and the interface cable from the back of each hard disk drive installed in the hard disk drive bracket 2 Remove the screw that secures the hard disk drive bracket to the front of the chassis 3 Grasp the handle on the front of the bracket and rotate the front of the bracket up until the hooks are free from the chassis 4 Lift the hard disk drive bracket out of the computer When you reinstall the hard disk drive bracket place the lowerback tab of the hard disk drive bracket into position be sure that the opening in the lower back tab is over the alignment tab on the chassis then rotate the front of the bracket
94. owersupply heat dissipation Low profile computers 808 BTU nominal Midsize computers 913 BTU nominal Mini tower computers 913 BTU nominal System Overview 1 31 Table 1 5 Technical Specifications continued Power continued Power supply voltage 90 to 135 V at 60 Hz 180 to 265 V at 50 Hz Backup battery 3 V CR2022 coin cell Physical Low profile computers Height 2 oa Sot dts 10 9 cm 4 3 inches WAGE eee dut te 40 89 cm 16 1 inches Depth 43 69 cm 172 inches Weight minimum 10 89 kg 24 0 Ib Midsize computers Height mcs 16 5 cm 6 5 inches WGI es soe tete ns 419 cm 16 5 inches Dept s cess outa See 44 5 cm 175 inches Weight minimum 12 7 kg 28 0 Ib Mini tower computers Height cz oS 44 4 cm 175 inches S To ng REDDE ME 20 6 cm 8 1 inches Depth s esci trate ds 43 7 cm 172 inches Weight minimum 14 9 kg 33 0 Ib Environmental Temperature Operating eet oes 10 to 35 C 50 to 95 F Storage 40 to 65 C 40 to 149 F Relative humidity 20 to 80 noncondensing Maximum vibration Operating 0 25 G at 3 to 200 Hz at 1 octave min Storage 0 5 G at 3 to 200 Hz at 1 octave min The maximum operating temperature of 35 C 95 F is for altitudes below 914 6 m 3000 ft Above 914 6 m 3000 ft the maximum operating temperature is reduced 1
95. pters 4 5 and 6 are chassis specific Midsize Chassis Mini Tower Chassis Figure 1 1 Chassis Configurations System Overview 1 1 Chassis Differences The three OptiPlex G1 chassis configurations differ primarily in the following expansion features Number of expansion slots available for PCI ISA expansion cards Number of available internal drive bays for EIDE drives Number of available extemal drive bays for diskette CD ROM or tape drives e Physical size and power supply types the midsize and mini tower systems use the same power supply Due to the physical differences in the three chassis configurations a separate parts removal and replacement chapter Chapters 4 through 6 is provided for each chassis type Chassis Similarities All three chassis configurations have the following similarities Same system board e Identical operational characteristics same BIOS POST memory microprocessor extemal I O ports and so on e Identical diagnostics diagnostic beep codes and diagnostic screen error messages see Chapters 1 through 3 and Appendix A Standard Features The features described in the following subsections are common to all chassis configurations Pentium II Microprocessor All OptiPlex G1 systems incorporate the Pentium Il microprocessor for improved operating speeds and overall performance Some of the major enhancement features of the Pentium Il microprocessor include internal 16 KB dat
96. puter Option 1 1 13 Riser Board for the Midsize Computer Option 2 1 13 Riser Board for the Mini Tower Computer 1 14 System Board Components 0 000 eee eee eee 1 16 System Board J umpers aan 1 17 DC Power Connector PT ph Nama Ru nA ema 1 22 DC Power Connectors P2 Midsize and Mini Tower Chassis P3 P4 P5 P6 and P9 All OptiPlex G1 Chassis 1 22 DC Power Connectors P2 Low Profile Chassis and P7 All OptiPlex G1 Chassis c cece eee eee eee 1 23 DC Power Cables for the Low Profile Computer 1 23 DC Power Distribution for the Low Profile Computer 1 24 DC Power Cables for the Midsize and Mini Tower Computers 0 00 cece eee eee 1 25 DC Power Distribution for the Midsize Computer 1 26 DC Power Distribution for the Mini Tower Computer 1 27 Internal View of the Low Profile Computer 4 3 Attaching the Optional Stand for Vertical Orientation 4 4 Computer Cover Removal 002000 cee cena 4 5 Eject Power and Reset Button Removal 4 6 Front Panel Insert Removal 00000 cee eae 4 7 Control Panel Removal 2 Sette obo enr oops 4 8 Drive Hardware a amg e KA LAG AND PALALA S Ea men 4 9 3 5 Inch Diskette Drive Removal aa 4 10 5 25 Inch Drive Assembly Removal s 4 11 Hard Disk Drive Assembly Removal 4 12 System Power Supply Removal aa 4 13 Expans
97. r or could not find particular disk sector Faulty diskette tape drive subsystem or hard disk drive subsystem defec tive system board Attachment failed to respond Diskette drive or hard disk drive controller cannot send data to associated drive Faulty interface cable or connector Bad command or file name Command entered does not exist or is not in pathname specified Bad command Bad error correction code ECC on disk read Controller has failed Diskette drive or hard disk drive controller detected uncorrectable read error Hard disk drive or asso ciated controller defective Faulty diskette tape drive subsystem or hard disk drive subsystem defec tive system board Beep Codes and Error Messages 33 Table 3 2 System Error Messages continued Message Definition Probable Causes Data error Computer received un recoverable data read error from diskette or hard disk drive Faulty diskette diskette drive or hard disk drive Decreasing available memory Read write failure during POST prevents system from using avail able memory One or more DIMMs faulty or improperly seated Diskette drive 0 seek failure Diskette drive 1 seek failure Diskette tape drive con troller could not locate specific sector or track Faulty or improperly inserted diskette incorrect configuration settings in System Setup
98. rd errors during POST Auto Power On Allows you to set the day and time you want the system to power on automatically The time uses the 24 hour format Wakeup On LAN Wakeup On LAN determines whether the Wakeup On LAN feature is set to Off or On You must reboot your system before a change takes effect NOTE A Wakeup On LAN capable NIC must be installed to use this functionality Power Management With the Power M anagement option enabled DPMS monitors and most EIDE drives automatically switch into low power mode during periods of system inactivity CAUTION Before enabling this feature check the monitor documentation to make sure that the system has a DPMS compliant monitor Otherwise there is a risk of damaging the monitor NOTE Not all EIDE hard disk drives support this feature Enabling this feature for a drive that does not support it may cause the EIDE drive to become inoperable until the system is restarted and the Power M anagement option is disabled Asset Tag Displays the customerprogrammable asset tag number for the system if an asset tag number has been assigned A 4 Dell OptiPlex G1 Managed PC Systems Service Manual Index Numbers 3 5 inch diskette drive removal low profile computer 4 10 midsize computer 5 10 mini tower computer 6 10 5 25 inch drive assembly removal low profile computer 4 11 midsize computer 5 11 mini tower computer 6 11 A AC power recept
99. rd Install to enable the password feature enable or default disable One set of speed jumpers must have a jumper plug installed otherwise the system defaults to an undetermined speed Interrupt Assignments Table 1 2 Interrupt Assignments IRQ Line Used By Available IRQO Generated by system timer IRQ1 Generated by keyboard controller IRQ2 Generated internally by interrupt controller to enable IRQ8 through IRQ15 IRQ3 Generated by super I O controller to indicate that the device con nected to the serial port COM 2 or COM 4 requires service IRQ4 Generated by super I O controller to indicate that the device con nected to the serial port COM 1 or COM 3 requires service IRQ5 Available for use by an expansion card IRQ6 Generated by super I O controller to indicate that diskette or tape drive requires service IRQ7 Generated by super I O controller to indicate that device con nected to parallel port requires service 1 18 Dell OptiPlex G1 Managed PC Systems Service Manual Table 1 2 Interrupt Assignments continued IRQ Line Used By Available IRQ8 Generated by RTC alarm event IRQ9 Available for use by an expansion card IRQ10 Available for use by an expansion card IRQ11 NIC default PCI IRQ IRQ12 Generated by keyboard controller to indicate that mouse s output buffer is full IRQ13 Generated by math coprocessor to indicate coprocessor error IRQ14 Generated by device connected to prima
100. re information Chassis Intrusion Detection The OptiPlex G1 systems provide chassis intrusion detection If the computer cover is removed the Chassis Intrusion setting in the System Setup program changes from Not Detected to Detected and the following message is dis played during the boot routine at system start up Alert Cover was previously removed To clear this field and allow future intrusions to be detected make sure that the computer cover is closed and then enter the System Setup program dur ing the system s POST as described in Appendix A System Setup Program Use the left or right arrow key to select Reset for the Chassis Intrusion cate gory This action changes the setting to its default Not Detected NOTE If a setup password has been assigned by someone else contact your network administrator for information on resetting the chassis intrusion detector Integrated Ethernet NIC Support Optional The OptiPlex G1 systems are available with or without integrated Ethemet NIC subsystem The integrated 10 100 M bps 3Com PCI 3C905B TX Ethemet NIC subsystem supports the Wakeup On LAN feature and the 10BASE T and 100BASE TX standards The NIC subsystem connects to the Ethernet network through a single RJ 45 connector on the back of the computer The RJ 45 connector and the NIC interface circuitry are mounted on the system board The NIC connector on the computer s back panel has the following indicators A
101. rfere with the cover or with proper airflow inside the computer NOTE After removing and replacing the chassis the chassis intrusion detector alerts you that the cover has been removed Refer to Chassis Intrusion Detec tion in Chapter 1 for instructions on resetting the chassis intrusion detector Removing and Replacing Parts on the M idsize Chassis 5 5 Eject Power and Reset Buttons computer cover upside down eject button power button ro Figure 5 4 Eject Power and Reset Button Removal To remove the eject power and reset buttons follow these steps 1 Lay the computer cover upside down on a flat work surface with the back of the cover facing you 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screwdriver and push in on the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover 5 6 Dell OptiPlex G1 Managed PC Systems Service Manual Front Panel Inserts 5 25 inch f front panel computer cover insert upside down S ring tabs 2 Figure 5 5 Front Panel Insert Removal To remove a front panel insert follow these steps 1 Lay the computer cover upside down on a flat work surface with the front of the cover facing you 2 From the front of the cov
102. rmal maintenance SEC Cartridge Heat Sink Assembly SEC cartridge release latches 2 heat sink heat sink securing clips 2 guide bracket assembly metal standoffs 2 Figure 6 23 SEC Cartridge Heat Sink Removal Removing and Replacing Parts on the Mini Tower Chassis 6 23 To remove the SEC cartridge heat sink assembly follow these steps WARNING The SEC cartridge heat sink assembly can get extremely A hot during system operations Be sure that the assembly has had suf ficient time to cool before touching it 1 Locate the SEC cartridge heat sink assembly 2 Disconnect the microprocessor fan connector from the 3 pin connector on the system board labeled FAN located between the SERIAL2 connector and the MONITOR connector see Figure 6 19 3 Release the two securing clips near the base of the heat sink from the metal standoffs 4 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to the heat sink assembly until the latches click 5 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient eX the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the SEC cartridge release latches out ward to lock the assembly onto the metal standoffs Sy
103. ry EIDE port to indicate that device requires service If the EIDE controller is disabled this line is available for other use IRQ15 Generated by device connected to secondary EIDE port to indi cate that device requires service If the EIDE controller is disabled this line is available for other use fan ISA expansion card is configured for IRQ11 the optional NIC or PCI IRQ is assigned to another available IRQ line DMA Channel Assignments Table 1 3 DREQ Line Assignments DREQ Line Used By Available DREQO Available DREQ1 Available DREQ2 Generated by super I O controller to initiate DMA cycle for attached diskette drive DREQ3 Available DREQ4 Generated by bus controller chip to activate second DMA controller DREQ5 Available DREQ6 Available DREQ7 Available NOTE The built in audio controller NIC optional and video controllers are assigned available DMA channels automatically during system start up System Overview 1 19 Hard Disk Drive Service Information The following subsections provide service related information about hard disk drive options for the OptiPlex G1 computers Hard Disk Drive for the Low Profile Computer The hard disk drive assembly consisting of the hard disk drive and the hard disk drive bracket is located inside the chassis at the left front of the computer and is attached to the bottom of the chassis One 1 inch high EIDE hard disk drive can be mounted on the hard disk dri
104. s 1 Insert a copy of the Dell Diagnostics Diskette into drive A Turn on all peripherals and the computer If the computer is already on press the reset button or Ctrl Alt Del to reboot the system 2 Check the power supply fan Does the fan run normally Yes Proceed to step 3 No Troubleshoot the system power supply 3 Watch the Num Lock Caps Lock and Scroll Lock indicators on the upper right corner of the keyboard After all three indicators flash momentarily the Num Lock indicator should light up and remain on Do these indicators flash on and off within approximately 10 seconds after the boot routine starts Yes Proceed to step 4 No Troubleshoot the system power supply If the troubleshooting pro cedure indicates that the system power supply is operational troubleshoot the system board Basic Troubleshooting 2 3 4 During the boot routine observe the system for any of the following e Diskette drive and hard disk drive access indicators These indicators light up in response to data being transferred to or from the drives If either of these indicators fails to light up during the boot routine trou bleshoot the diskette drive or hard disk drive subsystem as appropriate e System error messages These messages can indicate problems or provide status information If a system error message is displayed see Table 3 2 e Beep codes A beep code is a series of beeps that indicates an error con
105. s 5 Lift the system power supply from the computer 5 14 Dell OptiPlex G1 Managed PC Systems Service Manual Expansion Cards The computer has a removable expansion card cage The expansion card cage contains the riser board and any installed expansion cards Dell recommends that you remove the expansion card cage first before removing or installing expansion cards If you are not removing any expansion cards leave the external cables attached to them Expansion Card Cage expansion card cage Figure 5 14 Expansion Card Cage Removal To remove an expansion card cage follow these steps 1 Rotate the lever toward the back of the computer until it stops in the upright position 2 Lift the expansion card cage up and away from the computer To replace an expansion card cage keep the cage flush against the chassis to ensure that the lever engages the notch when the lever is depressed Removing and Replacing Parts on the Midsize Chassis 5 15 5 16 Expansion Card retaining screw expansion card card mounting bracket expansion card connector NIT card slot opening riser board Figure 5 15 Expansion Card Removal To remove an expansion card follow these steps 1 2 3 4 Disconnect any cables from the expansion card being removed Remove the expansion card cage Remove the retaining screw from the card mounting bracket Grasp the expansion card by its corners and carefu
106. s with the socket key Press the video memory upgrade module firmly into the socket and pivot the module downward until it clicks into place If you do not hear a sharp click when installing the video memory upgrade module remove the module and repeat steps 2 and 3 Replace the expansion card cage Replace the computer cover and reconnect the AC power cable to the AC outlet Press the power button on the computer to reboot the system As the system boots it automatically detects the presence of the new video memory upgrade module and automatically changes the system con figuration information in the System Setup program Enter the System Setup program and confirm that 4 MB is shown in the Video Memory category If the total memory is listed incorrectly repeat steps 1 through 6 to reseat the video memory upgrade module and verify that the computer acknowl edges the module Run the Video Test Group in the system diagnostics to test the new video memory upgrade module Dell OptiPlex G1 Managed PC Systems Service M anual Microprocessor To take advantage of future options in processor speed and functionality you can replace the microprocessor on your system board with any Dell supported microprocessor upgrade The microprocessor upgrade kit is shipped with an SEC cartridge heat sink assembly which includes the microprocessor micro processor heat sink and L2 cache memory module You may also have to resea
107. securing clips until the DIMM is released from its socket Dell OptiPlex G1 Managed PC Systems Service M anual 1 securing clips 2 Figure 4 17 DIMM Removal 3 Lift the DIMM away from the socket 4 Reinstall the replacement DIMM by pressing the DIMM fully into the socket and then closing the securing clips to lock the DIMM into the socket SR 2 securing clips 2 EJ 1 Figure 4 18 DIMM Installation 5 Replace all assemblies and cables previously removed Video Memory m notch video memory video memory upgrade socket upgrade module Figure 4 19 Installing a Video Memory Upgrade Module Removing and Replacing Parts on the Low Profile Chassis 4 19 4 20 You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module in the video memory upgrade socket on the system board Adding additional video memory increases the system s video performance and provides additional modes for high resolution expanded color applications To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTION To avoid possible damage to the video memory upgrade 1 socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the video memory upgrade module as shown in Figure 4 19 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mate
108. stem BOa o ou se xm ince d odit edt wa tae eae katte 1 16 System Board J umpers 00 eee ee 1 17 Interrupt Assignments 1 18 DMA Channel Assignments 000 cece eee eee nes 1 19 Hard Disk Drive Service Information 00 cece eee eee 1 20 Hard Disk Drive for the Low Profile Computer 1 20 Hard Disk Drive for the Midsize Computer 1 20 Hard Disk Drive for the Mini Tower Computer 1 20 Power Supply Service Data 1 20 Pin Assignments for the DC Power Connectors 1 22 DC Power Distribution lisse 1 23 Technical Specifications en ng e m mx WE A TEES 1 28 Basic Troubleshooting 2 1 Initial User Contact sete EPTten te EY STRPIG RAUM EUER E 2 1 Extemal Visual Inspection ss iive zo he REOR bo gaas RISE Eq EDS 2 2 Observing the Boot Routine 0 0 eee eens 2 3 Intemal Visual Inspection nasasa aaua 2 4 Eliminating Resource Conflicts 0 0 ccc eee 2 5 Running the System Diagnostics 0 0 cece eee ees 2 6 GEHING Helpi eirs decl eet Valens cee ERE KABAN A 26 Beep Codes and Error Messages 3 1 POST Beep CONG or NG ture Mid co Sch are s ar pe Ws nte qe ae a i ic n ls 3 1 System Error Messages esos v RE eke OUR ERE Pe TERRE 3 3 Removing and Replacing Parts on the Low Profile Chassis oo 4 Recommended Tools xa a seus sueuhiw bende eee wx ms RE UR 4 1 Precautionary
109. stem Battery BATTERY socket Figure 6 24 System Battery Installation To remove the system battery follow these steps 1 If possible boot the system and enter the System Setup program Then record important system configuration information see Appendix A System Setup Program for details 2 Turn off power to all peripherals and disconnect the AC power cable from its AC outlet 6 24 Dell OptiPlex G1 Managed PC Systems Service Manual 3 Remove the computer cover 4 Remove the expansion card cage and locate the battery in the front right corner of the system board adjacent to the DIMM con nectors see Figure 6 19 CAUTION If you pry out the battery with a blunt object be careful A not to touch the system board with the object Ensure that the object is inserted between the battery and the socket before attempting to pry out the battery Otherwise you may damage the system board by prying off the socket or by breaking traces on the system board 5 Remove the battery by carefully prying it out of its socket with your fingers or with a blunt nonconducting object such as a plas tic screwdriver WARNING There is a danger of the new battery exploding if it is incorrectly installed When you replace the system battery orient the new battery with the facing up see Figure 6 25 Replace the battery only with the same or equivalent type recommended by the manufacturer Dis card used batteries according to the
110. sts ice bier er awa Eis 6 20 DIMM Sas soe cere eb usage iuba S a tha d ax nate dure 6 21 Video Memorie oie et esse e et IE ape ed quist estote deas Pa Mrd 6 22 MIIGIMODIOGESSOF cM CT 6 23 SEC Cartridge Heat Sink Assembly 0000 e eee eee 6 23 System BALCONY s nsii gen ed EN A Rea RR BA Re E E T e Kata 6 24 System Setup Program A 1 System Setup Screen Enna BARA ANAK ed ewe kman T eda ee ANA A 2 Figure 1 1 Chassis Configurations a 11 Figure 1 2 8 Front Panel Features 000 a 1 7 Figure 1 3 Internal View of the Low Profile Chassis 1 8 Figure 1 4 Internal View of the Midsize Chassis 1 9 Figure 1 5 8 Intemal View of the Mini Tower Chassis 1 10 Figure 1 6 Computer Orientation Information 1 11 Figure 1 7 Riser Board for the Low Profile Computer 1 12 Figure 1 8 Figure 1 9 Figure 1 10 Figure 1 11 Figure 1 12 Figure 1 13 Figure 1 14 Figure 1 15 Figure 1 16 Figure 1 17 Figure 1 18 Figure 1 19 Figure 1 20 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 7 Figure 4 8 Figure 4 9 Figure 4 10 Figure 4 11 Figure 4 12 Figure 4 13 Figure 4 14 Figure 4 15 Figure 4 16 Figure 4 17 Figure 4 18 Figure 4 19 Figure 4 20 Figure 4 21 Figure 5 1 Figure 5 2 Figure 5 3 Figure 5 4 Figure 5 5 Riser Board for the Midsize Com
111. t or replace an SEC cartridge heat sink assembly during normal maintenance SEC Cartridge Heat Sink Assembly pe heat sink S e Na aa l SEC cartridge release latches 2 SEC cartridge securing clips 2 guide bracket assembly P fh metal standoffs 2 Figure 4 20 SEC Cartridge Heat Sink Removal To remove the SEC cartridge heat sink assembly follow these steps WARNING The SEC cartridge heat sink assembly can get extremely hot during system operations Be sure that the assembly has had suf ficient time to cool before touching it 1 Locate the SEC cartridge heat sink assembly 2 Disconnect the microprocessor fan connector from the 3 pin con nector on the system board labeled FAN located between the SERIAL2 connector and the MONITOR connector see Figure 4 16 Removing and Replacing Parts on the Low Profile Chassis 4 21 3 Release the two securing clips near the base of the heat sink from the metal standoffs 4 Locate and press inward on the SEC cartridge release latches located directly on top of the SEC cartridge adjacent to the heat sink assembly until the latches click 5 Lift the SEC cartridge heat sink assembly out of its guide bracket assembly connector on the system board NOTE When installing the SEC cartridge heat sink assembly carefully orient YK the assembly and press firmly with up to 25 pounds of force to mate the SEC cartridge with its connector Then slide the SEC
112. t s securing clips until the DIMM is released from its socket securing clips 2 Figure 6 20 DIMM Removal 3 Lift the DIMM away from the socket 4 Reinstall the replacement DIMM by pressing the DIMM fully into the socket and then closing the securing clips to lock the DIMM into the socket securing clips 2 ud 2 Figure 6 21 DIMM Installation 5 Replace all assemblies and cables previously removed Removing and Replacing Parts on the Mini Tower Chassis 6 21 Video Memory A SE notch video memory video memory upgrade socket upgrade module Figure 6 22 Installing a Video Memory Upgrade Module You can upgrade video memory from 2 to 4 MB by installing a video memory upgrade module in the video memory upgrade socket on the system board Adding additional video memory increases the system s video performance and provides additional modes for high resolution expanded color applications To install the video memory upgrade follow these steps 1 Remove the expansion card cage CAUTION To avoid possible damage to the video memory upgrade 1 socket and or video memory upgrade module the module is keyed and must be correctly positioned before inserting it into the socket 2 Orient the video memory upgrade module as shown in Figure 6 23 Then carefully align the module s edge connector pins with the socket ensuring that the slot in the module mates with the socket key 3 Press the video memory upgrade module
113. ternally Accessible Drive Assemblies The following subsections contain removal replacement procedures for drives installed in the externally accessible drive bays Removing and Replacing Parts on the M idsize Chassis 5 9 3 5 Inch Diskette Drive Assembly bracket mounting screw O drive mounting screws 2 hooks 2 front of computer Figure 5 8 3 5 Inch Diskette Drive Removal To remove the 3 5 inch diskette drive follow these steps 1 Disconnect the DC power cable and the interface cable from the back of the 3 5 inch diskette drive 2 Remove the bracket mounting screw 3 Rotate the left side of the 3 5 inch diskette drive assembly up and lift the assembly out of the chassis 4 Remove the two drive mounting screws from the left side of the drive and remove the drive from the bracket When you replace the 3 5 inch diskette drive be sure that the two hooks on the right side of the bracket engage the mounting holes in the side of the 3 5 inch diskette drive 5 10 Dell OptiPlex G1 Managed PC Systems Service Manual 5 25 Inch Drive Assembly retaining tabs 2 Figure 5 9 5 25 Inch Drive Assembly Removal To remove a 5 25 inch drive assembly from the middle or lower drive bay fol low these steps 1 Disconnect the DC power cable and the interface cable from the back of the drive 2 Press in on the two retaining tabs one on each side of the drive and slide the drive assembly forward to rem
114. the extemal visual inspection follow these steps 1 2 Turn off the computer the monitor and all peripherals Verify that all power cables are properly connected to the com puter the monitor and peripherals and their power sources Verify that the keyboard and mouse interface cables are firmly attached to the proper connectors on the back of the computer For a PS 2 compatible mouse the keyboard and mouse interface cable connectors are identical except for their labels For a serial mouse the mouse interface cable must be firmly attached to one of the serial port con nectors and its captive screws must be secure enough to ensure a firm connection Verify that any devices attached to the serial and parallel port connectors are properly connected Each of the serial and parallel port interface cables must be firmly attached to an appropriate connector on the back of the computer as well as to the interface connector on the device The captive screws that secure these connectors at each end of the interface cable must be secure enough to ensure a firm connection Verify that the video interface cable is firmly attached to the video connector on the back of the computer and to the connector on the back of the monitor For proper connection of the video monitor see the documentation for the monitor Inspect all external monitor controls for any obvious damage or improper settings For proper settings of the v
115. ty Faulty application or utility Memory tests terminated by keystroke Memory test did not complete POST memory test ter minated by pressing the spacebar key No boot device available System does not recog nize diskette drive or hard disk drive from which it is trying to boot Faulty diskette diskette tape drive subsystem hard disk drive hard disk drive subsystem or no boot disk in drive A No boot sector on hard disk drive Configuration settings in System Setup program incorrect or operating system corrupted Incorrect configuration settings in System Setup program or no operating system on hard disk drive No timer tick interrupt Timer on system board malfunctioning Defective system board Non system disk or disk error Diskette in drive A or hard disk drive does not have bootable operating system installed on it Faulty diskette diskette tape drive subsystem or hard disk drive subsystem Not a boot diskette No operating system on diskette No operating system on diskette Plug and Play System encountered System resource conflict Configuration problem in trying to Error configure one or more expansion cards Read fault MS DOS cannot read Faulty diskette diskette from diskette or hard tape drive subsystem or disk drive hard disk drive sub system defective system board Requested sec System cou
116. unting holes in the side of the 3 5 inch diskette drive 5 25 Inch Drive Assembly retaining tabs 2 Figure 6 10 5 25 Inch Drive Assembly Removal Removing and Replacing Parts on the Mini Tower Chassis 6 11 To remove a 5 25 inch drive assembly from the middle or lower drive bay fol low these steps 1 Disconnect the DC power cable and the interface cable from the back of the drive 2 Press in on the two retaining tabs one on each side of the drive and slide the drive assembly forward to remove it 3 Remove the four screws attaching the 5 25 inch drive to the mounting plate and lift the drive out of the mounting plate see Figure 6 11 Align the front of the drive flush with the tab at the front of the 5 25 inch drive mounting plate screws 4 ee eae amp Figure 6 11 5 25 Inch Drive Removal When you replace the 5 25 inch drive align the front of the drive flush with the tab at the front of the mounting plate Insert the four screws and tighten them in the order stamped on the bottom of the 5 25 inch drive mounting plate 6 12 Dell OptiPlex G1 Managed PC Systems Service M anual Hard Disk Drive Bracket drive cage Slide rail chassis slot hinge tabs 3 Sliding tab Figure 6 12 Hard Disk Drive Bracket Removal To remove the hard disk drive bracket follow these steps 1 Disconnect the DC power cable and the interface cable from the back of each hard disk drive insta
117. ure 4 4 Eject Power and Reset Button Removal To remove the eject power and reset buttons follow these steps 1 Lay the computer cover upside down on a flat work surface with the back of the cover facing you 2 To remove the 3 5 inch diskette drive eject button pull gently on the plastic part of the button until it comes free 3 To remove the power button or the reset button use a small screwdriver and push in on the two or three plastic clips that hold the button to the computer cover When these clips are released the button comes free from the front panel of the cover 4 6 Dell OptiPlex G1 Managed PC Systems Service Manual Front Panel Inserts 5 25 inch front panel insert O computer cover upside down posts 2 Figure 4 5 Front Panel Insert Removal To remove a front panel insert follow these steps 1 Lay the computer cover upside down on a flat work surface with the front of the cover facing you From the front of the cover use your thumbs to push inward on the insert until it slides off the two posts To replace a 5 25 inch front panel insert position the two ring tabs over the posts on the inside of the bay opening and then press the ring tabs over the posts If necessary use a 1 4 inch nutdriver to help push on the ring tabs Removing and Replacing Parts on the Low Profile Chassis 4 7 Control Panel x chassis O Mg o mounting screw d Za S control panel cabl
118. ve bracket Hard Disk Drive for the Midsize Computer The hard disk drive bracket is located next to the externally accessible drive bays at the front of the computer The hard disk drive bracket can contain either one or two 1 inch high EIDE hard disk drives or one 1 inch high EIDE hard disk drive and one 16 inch high EIDE hard disk drive Hard Disk Drive for the Mini Tower Computer The hard disk drive bracket is located beneath the extemally accessible drive bays at the front of the computer The hard disk drive bracket can contain either one or two 1 inch high EIDE hard disk drives or one 1 inch high EIDE hard disk drive and one 16 inch high EIDE hard disk drive Power Supply Service Data The low profile computers have a 145 W system power supply and the mid size and mini tower computers have a 200 W system power supply All system power supplies can operate from an AC power source of 115 VAC at 50 to 60 Hz or 230 VAC at 50 to 60 Hz WARNING The voltage selection switch located on the back of the A power supply assembly must be set to the correct operating voltage 115 or 230 V before you plug the power cable into an AC outlet The system power supply provides the DC operating voltages and currents listed in Table 1 4 NOTE The power supply produces DC voltages only under its loaded condi AL tion Therefore when you measure these voltages the DC power input connectors must be connected to their corresponding power input

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